Llama Wrangler Achievement
Capture the Quarantine Zone monster.Story-related; cannot be missed.
Towards the end of Chapter 1, you'll place the final thumper and a monster will be hiding in the dark around the room. Destroy all of the crates with your guns, then you'll be able to spot the red eyes in one of the dark corners. Look at it, hold and press to choose Groot to catch the monster, unlocking this achievement.