Accomplish the indicated achievement to get the corresponding number of Gamerscore points:
- 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.
Additionally, there are four secret achievements:
- 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.