Here are the Battlefield 3 Weapon Attachments.

To unlock each weapon attachment, you must get the specified ammount of kills.

Support Kit M27 IAR ACOG 4X 90 kills Flash Supressor 60 kills Foregrip 30 kills Holographic (HOLO) 10 kills IRNV (IRx1) 100 kills KOBRA RDS 200 kills Laser Sight 20 kills M145 (3.4x) 50 kills Reflex Red Dot Sight 70 kills Rifle Scope (6x) 125 kills Supressor 80 kills Tactical Light 40 kills PK-A (3.4x) 175 kills PKA-S (HOLO) 150 kills PKS-07 (7x) 270 kills PSO-1 (4x) 235 kills RPK-74M ACOG 4X 235 kills Flash Supressor 60 kills Foregrip 30 kills Holographic (HOLO) 150 kills IRNV (IRx1) 100 kills KOBRA RDS 70 kills Laser Sight 20 kills M145 (3.4x) 175 kills PK-A (3.4x) 50 kills PKA-S (HOLO) 10 kills PKS-07 (7x) 125 kills PSO-1 (4x) 90 kills Reflex Red Dot Sight 200 kills Rifle Scope (6x) 270 kills Supressor 80 kills Tactical Light 40 kills M240B ACOG 4X 125 kills Extended Mag 30 kills Flash Supressor 20 kills Foregrip 60 kills Holographic (HOLO) 50 kills IRNV (IRx1) 100 kills KOBRA RDS 200 kills Laser Sight 70 kills M145 (3.4x) 10 kills PK-A (3.4x) 150 kills PKA-S (HOLO) 175 kills PSO-1 (4x) 235 kills Reflex Red Dot Sight 80 kills Supressor 90 kills Tactical Light 40 kills M249 ACOG 4X 125 kills Extended Mag 30 kills Flash Supressor 20 kills Foregrip 60 kills Holographic (HOLO) 50 kills IRNV (IRx1) 100 kills KOBRA RDS 200 kills Laser Sight 70 kills M145 (3.4x) 10 kills PK-A (3.4x) 150 kills PKA-S (HOLO) 175 kills PSO-1 (4x) 235 kills Reflex Red Dot Sight 80 kills Supressor 90 kills Tactical Light 40 kills PKP PECHENEG ACOG 4X 235 kills Extended Mag 30 kills Flash Supressor 20 kills Foregrip 60 kills Holographic (HOLO) 175 kills IRNV (IRx1) 100 kills KOBRA RDS 80 kills Laser Sight 70 kills M145 (3.4x) 150 kills PK-A (3.4x) 100 kills PKA-S (HOLO) 50 kills PSO-1 (4x) 125 kills Reflex Red Dot Sight 200 kills Supressor 90 kills Tactical Light 40 kills M60E4 ACOG 4X 125 kills Extended Mag 30 kills Flash Supressor 20 kills Foregrip 60 kills Holographic (HOLO) 50 kills IRNV (IRx1) 100 kills KOBRA RDS 200 kills Laser Sight 70 kills M145 (3.4x) 10 kills PK-A (3.4x) 150 kills PKA-S (HOLO) 175 kills PSO-1 (4x) 235 kills Reflex Red Dot Sight 80 kills Supressor 90 kills Tactical Light 40 kills Assault Kit M16A4 ACOG 4X 10 kills Bipod 60 kills Flash Supressor 175 kills Foregrip 30 kills Heavy Barrel 20 kills Holographic (HOLO) 80 kills IRNV (IRx1) 100 kills KOBRA RDS 235 kills Laser Sight 90 kills M145 (3.4x) 150 kills PK-A (3.4x) 350 kills PKA-S (HOLO) 270 kills PKS-07 (7x) 300 kills PSO-1 (4x) 200 kills Reflex Red Dot Sight 50 kills Rifle Scope (6x) 125 kills Supressor 70 kills Tactical Light 40 kills AK-74M ACOG 4X 200 kills Bipod 60 kills Flash Supressor 175 kills Foregrip 30 kills IRNV (IRx1) 100 kills Heavy Barrel 20 kills Holographic (HOLO) 270 kills KOBRA RDS 50 kills Laser Sight 90 kills M145 (3.4x) 350 kills PK-A (3.4x) 150 kills PKA-S (HOLO) 80 kills PKS-07 (7x) 125 kills PSO-1 (4x) 10 kills Reflex Red Dot Sight 235 kills Rifle Scope (6x) 300 kills Supressor 70 kills Tactical Light 40 kills M416 ACOG 4X 10 kills Bipod 60 kills Flash Supressor 175 kills Foregrip 30 kills Heavy Barrel 20 kills Holographic (HOLO) 80 kills IRNV (IRx1) 100 kills KOBRA RDS 235 kills Laser Sight 90 kills M145 (3.4x) 150 kills PK-A (3.4x) 350 kills PKA-S (HOLO) 270 kills PKS-07 (7x) 300 kills PSO-1 (4x) 200 kills Reflex Red Dot Sight 50 kills Rifle Scope (6x) 125 kills Supressor 70 kills Tactical Light 40 kills AEK971 ACOG 4X 200 kills Bipod 60 kills Flash Supressor 175 kills Foregrip 30 kills Heavy Barrel 20 kills Holographic (HOLO) 270 kills IRNV (IRx1) 100 kills KOBRA RDS 50 kills Laser Sight 90 kills M145 (3.4x) 350 kills PK-A (3.4x) 150 kills PKA-S (HOLO) 80 kills PKS-07 (7x) 125 kills PSO-1 (4x) 10 kills Reflex Red Dot Sight 235 kills Rifle Scope (6x) 300 kills Supressor 70 kills Tactical Light 40 kills F2000 ACOG 4X 10 kills Bipod 60 kills Flash Supressor 175 kills Foregrip 30 kills Heavy Barrel 20 kills Holographic (HOLO) 80 kills IRNV (IRx1) 100 kills KOBRA RDS 235 kills Laser Sight 90 kills M145 (3.4x) 150 kills PK-A (3.4x) 350 kills PKA-S (HOLO) 270 kills PKS-07 (7x) 300 kills PSO-1 (4x) 200 kills Reflex Red Dot Sight 50 kills Rifle Scope (6x) 125 kills Supressor 70 kills Tactical Light 40 kills AN94 ACOG 4X 200 kills Bipod 60 kills Flash Supressor 175 kills Foregrip 30 kills Heavy Barrel 20 kills Holographic (HOLO) 270 kills IRNV (IRx1) 100 kills KOBRA RDS 50 kills Laser Sight 90 kills M145 (3.4x) 350 kills PK-A (3.4x) 150 kills PKA-S (HOLO) 80 kills PKS-07 (7x) 125 kills PSO-1 (4x) 10 kills Reflex Red Dot Sight 235 kills Rifle Scope (6x) 300 kills Supressor 70 kills Tactical Light 40 kills Recon Kit MK11 ACOG 4X 10 kills Ballistic (12x) 80 kills Bipod 60 kills Foregrip 30 kills Holographic (HOLO) 50 kills IRNV (IRx1) 100 kills KOBRA RDS 235 kills Laser Sight 20 kills M145 (3.4x) 150 kills PK-A (3.4x) 270 kills PKA-S (HOLO) 200 kills PKA-S (HOLO) 125 kills PSO-1 (4x) 175 kills Reflex Red Dot Sight 90 kills Supressor 70 kills Tactical Light 40 kills SVD ACOG 4X 175 kills Ballistic (12x) 80 kills Bipod 60 kills Foregrip 30 kills Holographic (HOLO) 200 kills IRNV (IRx1) 100 kills KOBRA RDS 90 kills Laser Sight 20 kills M145 (3.4x) 270 kills PK-A (3.4x) 150 kills PKA-S (HOLO) 50 kills PSO-1 (4x) 10 kills Reflex Red Dot Sight 235 kills Rifle Scope (6x) 125 kills Supressor 70 kills Tactical Light 40 kills SV98 ACOG 4X 175 kills Ballistic (12x) 10 kills Bipod 30 kills Holographic (HOLO) 200 kills IRNV (IRx1) 100 kills KOBRA RDS 90 kills Laser Sight 20 kills M145 (3.4x) 270 kills PK-A (3.4x) 150 kills PKA-S (HOLO) 80 kills PSO-1 (4x) 50 kills Reflex Red Dot Sight 235 kills Rifle Scope (8x) 125 kills Straight Pull Bolt 60 kills Supressor 70 kills Tactical Light 40 kills SKS ACOG 4X 175 kills Ballistic (12x) 80 kills Bipod 60 kills Foregrip 30 kills Holographic (HOLO) 200 kills IRNV (IRx1) 100 kills KOBRA RDS 90 kills Laser Sight 20 kills M145 (3.4x) 270 kills PK-A (3.4x) 150 kills PKA-S (HOLO) 50 kills PSO-1 (4x) 10 kills Reflex Red Dot Sight 235 kills Rifle Scope (8x) 125 kills Supressor 70 kills Tactical Light 40 kills M40A5 ACOG 4X 50 kills Ballistic (12x) 10 kills Bipod 30 kills Holographic (HOLO) 80 kills IRNV (IRx1) 100 kills KOBRA RDS 200 kills Laser Sight 20 kills M145 (3.4x) 150 kills PK-A (3.4x) 235 kills PKS-07 (7X) 125 kills PSO-1 (4X) 175 kills Reflex Red Dot Sight 90 kills Straight Pull Bolt 60 kills Supressor 70 kills Tactical Light 40 kills M98B ACOG 4X 50 kills Ballistic (12x) 10 kills Bipod 30 kills Holographic (HOLO) 80 kills IRNV (IRx1) 100 kills KOBRA RDS 235 kills Laser Sight 20 kills M145 (3.4x) 150 kills PK-A (3.4x) 270 kills PKA-S (HOLO) 200 kills PKS-07 (7X) 125 kills PSO-1 (4X) 175 kills Reflex Red Dot Sight 90 kills Straight Pull Bolt 60 kills Supressor 70 kills Tactical Light 40 kills Engineer Kit M4A1 ACOG 4X 70 kills Bipod 90 kills Flash Supressor 175 kills Foregrip 30 kills Heavy Barrel 80 kills Holographic (HOLO) 50 kills IRNV (IRx1) 100 kills KOBRA RDS 200 kills Laser Sight 20 kills M145 (3.4x) 150 kills PK-A (3.4x) 350 kills PKA-S (HOLO) 235 kills PKS-07 (7x) 300 kills PSO-1 (4x) 270 kills Reflex Red Dot Sight 10 kills Rifle Scope (6x) 125 kills Supressor 60 kills Tactical Light 40 kills AK-74u ACOG 4X 270 kills Flash Supressor 175 kills Heavy Barrel 80 kills Holographic (HOLO) 235 kills IRNV (IRx1) 100 kills KOBRA RDS 10 kills Laser Sight 20 kills M145 (3.4x) 150 kills PK-A (3.4x) 30 kills PKA-S (HOLO) 50 kills PKS-07 (7x) 90 kills PSO-1 (4x) 70 kills Reflex Red Dot Sight 200 kills Rifle Scope (6x) 125 kills Supressor 60 kills Tactical Light 40 kills SCAR ACOG 4X 70 kills Bipod 90 kills Flash Supressor 175 kills Foregrip 30 kills Heavy Barrel 80 kills Holographic (HOLO) 50 kills IRNV (IRx1) 100 kills KOBRA RDS 200 kills Laser Sight 20 kills M145 (3.4x) 150 kills PK-A (3.4x) 350 kills PKA-S (HOLO) 235 kills PKS-07 (7x) 300 kills PSO-1 (4x) 270 kills Reflex Red Dot Sight 10 kills Rifle Scope (6x) 125 kills Supressor 60 kills Tactical Light 40 kills A91 ACOG 4X 270 kills Flash Supressor 175 kills Heavy Barrel 80 kills Holographic (HOLO) 235 kills IRNV (IRx1) 100 kills KOBRA RDS 10 kills Laser Sight 20 kills M145 (3.4x) 150 kills PK-A (3.4x) 30 kills PKA-S (HOLO) 50 kills PKS-07 (7x) 90 kills PSO-1 (4x) 70 kills Reflex Red Dot Sight 200 kills Rifle Scope (6x) 125 kills Supressor 60 kills Tactical Light 40 kills G36C ACOG 4X 70 kills Bipod 90 kills Flash Supressor 175 kills Foregrip 30 kills Heavy Barrel 80 kills Holographic (HOLO) 50 kills IRNV (IRx1) 100 kills KOBRA RDS 200 kills Laser Sight 20 kills M145 (3.4x) 150 kills PK-A (3.4x) 350 kills PKA-S (HOLO) 235 kills PKS-07 (7x) 300 kills PSO-1 (4x) 270 kills Reflex Red Dot Sight 10 kills Rifle Scope (6x) 125 kills Supressor 60 kills Tactical Light 40 kills General Kit 870MCS 12G Flechette 20 kills 12G Frag 60 kills 12G Slug 90 kills ACOG 4X 70 kills Extended Mags 30 kills Flash Supressor 175 kills Holographic (HOLO) 40 kills IRNV (IRx1) 100 kills KOBRA RDS 200 kills Laser Sight 80 kills M145 (3.4x) 150 kills PK-A (3.4x) 350 kills PKA-S (HOLO) 235 kills PKS-07 (7x) 300 kills PSO-1 (4x) 270 kills Reflex Red Dot Sight 10 kills Rifle Scope (6x) 125 kills Tactical Light 50 kills PP-2000 ACOG 4X 80 kills Extended Mags 60 kills Holographic (HOLO) 125 kills IRNV (IRx1) 100 kills KOBRA RDS 10 kills Laser Sight 20 kills M145 (3.4x) 150 kills PK-A (3.4x) 70 kills PKA-S (HOLO) 40 kills Reflex Red Dot Sight 90 kills Supressor 30 kills Tactical Light 50 kills UMP-45 ACOG 4X 80 kills Flash Supressor 60 kills Holographic (HOLO) 40 kills IRNV (IRx1) 100 kills KOBRA RDS 90 kills Laser Sight 20 kills M145 (3.4x) 70 kills PK-A (3.4x) 150 kills PKA-S (HOLO) 125 kills Reflex Red Dot Sight 10 kills Supressor 30 kills Tactical Light 50 kills M1014 12G Flechette 20 kills 12G Frag 60 kills 12G Slug 90 kills ACOG 4X 70 kills Extended Mags 30 kills Flash Supressor 175 kills Holographic (HOLO) 40 kills IRNV (IRx1) 100 kills KOBRA RDS 200 kills Laser Sight 80 kills M145 (3.4x) 150 kills PK-A (3.4x) 350 kills PKA-S (HOLO) 235 kills PKS-07 (7x) 300 kills PSO-1 (4x) 270 kills Reflex Red Dot Sight 10 kills Rifle Scope (6x) 125 kills Tactical Light 50 kills PDW-R ACOG 4X 80 kills Extended Mags 60 kills Holographic (HOLO) 40 kills IRNV (IRx1) 100 kills KOBRA RDS 90 kills Laser Sight 20 kills M145 (3.4x) 70 kills PK-A (3.4x) 150 kills PKA-S (HOLO) 125 kills Reflex Red Dot Sight 10 kills Supressor 30 kills Tactical Light 50 kills SAIGA 12K 12G Flechette 20 kills 12G Frag 60 kills 12G Slug 90 kills ACOG 4X 270 kills Extended Mags 30 kills Flash Supressor 175 kills Holographic (HOLO) 235 kills IRNV (IRx1) 100 kills KOBRA RDS 10 kills Laser Sight 80 kills M145 (3.4x) 350 kills PK-A (3.4x) 150 kills PKA-S (HOLO) 40 kills PKS-07 (7x) 125 kills PSO-1 (4x) 70 kills Reflex Red Dot Sight 200 kills Rifle Scope (6x) 300 kills Tactical Light 50 kills DAO-12 12G Frag 50 kills 12G Slug 80 kills ACOG 4X 60 kills Extended Mags 20 kills Flash Supressor 150 kills Holographic (HOLO) 30 kills IRNV (IRx1) 90 kills KOBRA RDS 175 kills Laser Sight 70 kills M145 (3.4x) 125 kills PK-A (3.4x) 300 kills PKA-S (HOLO) 200 kills PKS-07 (7x) 270 kills PSO-1 (4x) 235 kills Reflex Red Dot Sight 10 kills Rifle Scope (6x) 100 kills Tactical Light 40 kills P90 ACOG 4X 80 kills Flash Supressor 60 kills Holographic (HOLO) 40 kills IRNV (IRx1) 100 kills KOBRA RDS 90 kills Laser Sight 20 kills M145 (3.4x) 70 kills PK-A (3.4x) 150 kills PKA-S (HOLO) 125 kills Reflex Red Dot Sight 10 kills Supressor 30 kills Tactical Light 50 kills USAS-12 12G Flechette 20 kills Flash Supressor 175 kills Holographic (HOLO) 235 kills IRNV (IRx1) 100 kills KOBRA RDS 10 kills Laser Sight 80 kills M145 (3.4x) 350 kills PK-A (3.4x) 150 kills PKA-S (HOLO) 40 kills PKS-07 (7x) 125 kills PSO-1 (4x) 70 kills Reflex Red Dot Sight 200 kills Rifle Scope (6x) 300 kills Tactical Light 50 kills AS VAL ACOG 4X 90 kills Holographic (HOLO) 125 kills IRNV (IRx1) 60 kills KOBRA RDS 30 kills Laser Sight 50 kills M145 (3.4x) 175 kills PK-A (3.4x) 80 kills PKA-S (HOLO) 40 kills PKS-07 (7x) 70 kills PSO-1 (4x) 10 kills Reflex Red Dot Sight 100 kills Rifle Scope (6x) 150 kills Tactical Light 20 kills MP7 ACOG 4X 80 kills IRNV (IRx1) 100 kills Extended Mags 60 kills Holographic (HOLO) 40 kills KOBRA RDS 90 kills Laser Sight 20 kills M145 (3.4x) 70 kills PK-A (3.4x) 150 kills PKA-S (HOLO) 125 kills Reflex Red Dot Sight 10 kills Supressor 30 kills Tactical Light 50 kills