| Achievement | Unlocked | Global Unlocks | |
|---|---|---|---|
|
Gate 2 Unlocked Pick up the 2nd key and go outside |
291 | ||
|
Gate 1 Unlocked Pick up the 1st key and enter the base |
507 | ||
|
Congrats, You're A Legend Defeat the final boss and beat the game in Legendary Mode |
55 | ||
|
Covenant Defeated Defeat the final boss and beat the game |
180 | ||
|
Boosted Boots Find the Speed Boots to move faster |
231 | ||
|
Gun Upgrade Find the Sniper Rifle |
327 | ||
|
Covenant Bested Beat the game without losing a life or picking up a shield |
60 | ||
|
Hey Cortana, I Need A Gun. Pick up the M6D Pistol |
539 | ||
|
Gate 3 Unlocked Pick up the 3rd key and enter the final area |
226 |