Clear Mission 2 on Easy Difficulty
Clear Mission 3 on Easy Difficulty
Clear Mission 4 on Easy Difficulty
Clear Mission 5 on Easy Difficulty
Clear Mission 6 on Easy Difficulty
Clear Mission 1 on Normal Difficulty
Clear Mission 2 on Normal Difficulty
Clear Mission 3 on Normal Difficulty
Clear Mission 4 on Normal Difficulty
Clear Mission 5 on Normal Difficulty
Clear Mission 6 on Normal Difficulty
Clear Mission 1 on Hard Difficulty
Clear Mission 2 on Hard Difficulty
Clear Mission 3 on Hard Difficulty
Clear Mission 4 on Hard Difficulty
Clear Mission 5 on Hard Difficulty
Clear Mission 6 on Hard Difficulty
Clear Mission 1 on Hardest Difficulty
Clear Mission 2 on Hardest Difficulty
Clear Mission 3 on Hardest Difficulty
Clear Mission 4 on Hardest Difficulty
Clear Mission 5 on Hardest Difficulty
Clear Mission 6 on Hardest Difficulty
Clear Mission 1 on Inferno Difficulty
Clear Mission 2 on Inferno Difficulty
Clear Mission 3 on Inferno Difficulty
Clear Mission 4 on Inferno Difficulty
Clear Mission 5 on Inferno Difficulty
Clear Mission 6 on Inferno Difficulty
Clear all 6 missions on Easy Difficulty without failing a mission
Clear all 6 missions on Normal Difficulty without failing a mission
Clear all 6 missions on Hard Difficulty without failing a mission
Clear all 6 missions on Hardest Difficulty without failing a mission
Clear all 6 missions on Inferno Difficulty without failing a mission
Clear all 6 Extra Missions
Obtain 10% of all weapons
Obtain 50% of all weapons
Obtain 80% of all weapons
Obtain 100% of all weapons