Mass Effect achievements

Mass Effect

4.4 from 18250 votes

There are 49 Mass Effect achievements (45 without DLC) worth 2,089 (1,200)

195,740 tracked gamers have this game, 17,406 have completed it (8.89%)

Achievement Details

Sentinel Ally in Mass Effect

Sentinel Ally48 (20)

Complete the majority of the game with the Alliance sentinel squad member

  • Unlocked by 33,704 tracked gamers (17% - TA Ratio = 2.40) 195,745  

Achievement Guide for Sentinel Ally

176,195 (110,644)
Achievement won on 10 Dec 07
TA Score for this game: 2,089
Posted on 10 September 08 at 01:08
This solution has 37 positive votes and 4 negative votes. Please log in to vote.
You get the sentinel, Kaiden, from the start. Keep him in your party to do all the missions and about 40-45 assignments. You should unlock this achievements even before finishing the playthrough since both Kaiden and Ashley are in your party during which you have already done several missions before picking up other potential party members.

For missions see For assignments, see

Because Kaiden is a sentinel class with both biotic and tech abilities you'll want to balance your party out. You should go for this achievement when you're playing either strictly as a biotic or tech, or are simply a soldier class.

*** Spoiler Alert ***

Toward the end of Virmire you'll need to make a choice to save either Kaiden or Ashley, the two humans originally in your party. Choose Kaiden because you cannot save both.
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