Sticky Situation Achievement in Doom 3: BFG Edition
Defeat the Vagary boss in DOOM 3
How to unlock Sticky Situation
Story related and cannot be missed.
This boss is fairly simple to beat. The Vagary is a female spider like enemy that is actually a normal enemy later in the game, but this first encounter is considered a boss. Just keep dodging her telekinesis attacks and let her have it with whatever you have ammo for. The Chaingun works very well for this boss.