Halo: The Master Chief Collection / Achievements
01Did You Major in Marine Bio?
Halo: Reach: Encounter the hidden marines on Exodus.
- Unlocked by
- 1.3%
- Rarity
- Very rare
- Hidden achievement
- No
Data from Steam — Steam Web API Terms of Use. Last updated .
Halo: The Master Chief Collection / Achievements
Halo: Reach: Encounter the hidden marines on Exodus.
Data from Steam — Steam Web API Terms of Use. Last updated .