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Call of Duty: World at War

Rifles:
Aperture Sight - Finish Marksman Challenge 2
Flash Hider - Finish Marksman Challenge 1
Gewehr 43 - Get to Level 7
M1 Garand - Get to Level 17
M1A1 Carbine - Get to Level 65
Rifle Grenade - Finish Marksman Challenge 4
STG-44 - Get to Level 37
Suppressor - Finish Marksman Challenge 1
SVT-40 - Get to Level 4
Telescopic Sight - Finish Marksman Challenge 3

Veteran Mode
Get to level 32 in Co-Op.

Zombie Mode
Complete Campaign Mode once.