tracking their Halo: The Master Chief Collection achievements.
Click here to track your progress.
Add-on

Halo 3: ODST

2,917
990
99
4.51
239,357
4,438 (2%)
20-25h
Halo 3: ODST

ONI Alpha Site achievement in Halo MCC

ONI Alpha Site

H3: ODST: Complete ONI Alpha Site.

ONI Alpha Site0
Hide ads

How to unlock the ONI Alpha Site achievement

  • CyberPunch83CyberPunch83
    03 May 2018 16 May 2018
    Story related and cannot be missed. This mission is triggered from the satchel charge detonator scrap found in Mombasa Streets.
  • Have you got any tips or tricks to unlock this achievement?
    Add a guide to share them with the community.

    Add a guide
Do you have a question about this achievement? Please post it in the Halo: The Master Chief Collection Forum