Aliens Colonial Marines
60 Achievements
1,250
35-40h
Coming Outta the Walls!
Kill a Xenomorph climbing on the walls or ceiling
10
How to unlock the Coming Outta the Walls! achievement in Aliens Colonial Marines - Definitive Guide
Good place is the first level after getting the recorder, move through the labs and you will come to a T intersection, the left is were you go to progress but the right will be a spawn point were several aliens come out, should be easy pickings from there.
Good Luck!
You will likely unlock this while attempting the method for "Entry Prohibited." Once again, I had this finished before the end of mission one. Shoot any aliens on the walls or on the ceiling (more often on walls) to get this achievement.
Another trophy that should unlock naturally during your campaign playthrough. You will encounter many Xenomorphs that are climbing the walls and the chances of you killing one is very likely. If you haven't unlocked it by the time you reach the fourth chapter, No Hope in Hadley's, the long corridor section with the Smart Gun is ideal for this, as not only are there a fairly decent number of Xenomorphs climbing on the walls but the auto-tracking of the Smart Gun will ensure that you hit them.
Good place is the first level after getting the recorder, move through the labs and you will come to a T intersection, the left is were you go to progress but the right will be a spawn point were several aliens come out, should be easy pickings from there.
Good Luck!