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My Buddy Chips

Halo CE: Fight alongside Chips Dubbo and listen to his words of wisdom.

My Buddy Chips0
5 guidesOnline/OfflineSingle PlayerCooperative
Ditto51Ditto51209,706
12 Nov 2014
33 2 0
The other two solutions say that you can get it on Pillar of Autumn, I personally got it on Truth and Reconciliation. (The third mission). So I would say that the achievement is mostly random but you should get it at some point during the CE campaign. And obviously it will not be possible to unlock on the later levels because you stop having marines on your side after the 343 Guilty Spark level.