XCOM: Enemy Unknown achievements

XCOM: Enemy Unknown

4.4 from 2652 votes

There are a maximum of 55 XCOM: Enemy Unknown achievements (50 without DLC) worth 3,738 (1,100)

46,678 tracked gamers have this game, 595 have completed it (1.27%)

Achievement Details

Secret Achievement in XCOM: Enemy Unknown

Secret Achievement19 (10)

Continue playing to unlock this secret achievement. (Secret)

  • Unlocked by 13,552 tracked gamers (29% - TA Ratio = 1.85) 46,678  

Achievement Guide for On the Shoulders of Giants

246,559 (128,465)
Achievement won on 14 Oct 12
TA Score for this game: 3,738
Posted on 24 October 12 at 18:07, Edited on 25 October 12 at 21:59
This solution has 4 positive votes and 0 negative votes. Please log in to vote.
This achievement is story-related, and is therefore unmissable.

After shooting down and investigating the Overseer craft (which is only available after building and activation of the Hyperwave Relay), and recovering and researching the Ethereal Device, you will be tasked with a new objective: "Construct the Gollop Chamber," with the purpose of using the Ethereal Device (only useable by a Psionic Soldier) in protective containment. After completing this construction, the achievement will unlock.

Construction of the Gollop Chamber requires:

5 Power
200 credits
10 Elerium
10 Alloys
1 Ethereal Device

Note: If you're unable to use the Gollop Chamber with one of your Psionic soldiers, try equipping the soldier with the Psi Armor, and trying again.
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