ACHIEVEMENT - HOW TO UNLOCK
Enlistment (5 points) - Enter the Main Menu.
Crucible (5 points) - Clear the game on Normal in single player mode.
Onslaught (5 points) - Clear the game on Hard in single player mode.
Wings of Friendship (5 points) - Play a CO-OP Mode game.
Sandwich Man (10 points) - Kill 10 Sandwich enemies.
Snake Killer (10 points) - Kill 10 Snake enemies.
Mosquito Killer (10 points) - Kill 10 Mosquito enemies.
Valiant Warrior (20 points) - Kill 100 targets in CO-OP Mode.
Like taking candy from a baby (20 points) - Occupied all control points in Control Point mode.
Gold Hammer (30 points) - Cleared the game on Normal difficulty or harder without losing a life.
May Day King (30 points) - Got shot down 256 times.
Ruler of the Universe (50 points) - Earned every rank.