Outsiders: I finished the game at 100% and the following achievements never popped up:
Looked Everywhere
Loot all Scavenging Locations.
ink Eye Thrives
Reduce threat to 0 in the Knit Sack region around Pink Eye's Stronghold.
Spreading the Word
Clear all threat in Pink Eye's territory.
Stop and Smell the Roses
Complete all Wasteland missions.
Up to the Task
Complete all non-repeating challenges.
Wasteland Chef
Eat a meal of maggots.
I really never even cared about the achievements in this game. I know some of them are repeatable. I think when you restart your game or something. Either way by end game I was at Road Warrior 227 and had cleared about every zone. As far as I know levels after you max everything do nothing anyway. So achievement hunting is just one of those pointless meta game things they threw in there for console players.