Halo: The Master Chief Collection / Achievements
01Mystery Achievement
Inscrutable. Mysterious.
- Unlocked by
- 1.6%
- Rarity
- Very rare
- Hidden achievement
- No
Data from Steam — Steam Web API Terms of Use. Last updated .
Halo: The Master Chief Collection / Achievements
Inscrutable. Mysterious.
Data from Steam — Steam Web API Terms of Use. Last updated .