Defeat 25 Bandits
Scattered around Biomutant’s open world are 11 bandit camps filled with critters for you to fight and loot to acquire. Each camp has at least two normal-sized critters and two big critters (one of which is the bandit leader). These camps are relatively easy to spot on your map. You just need to look for a square-shaped box ringed by spikes.
Defeating 25 of these Bandits will award you with the Thugs achievement.