Here is the full list of all 32 Boss 101 achievements.
Pass Level 30 and Mobius One
Dolphin partnership award
Visit Gopher City for the first time
All gophers returned
Every Upgrade Complete
Purchase all Level 3 Guns
Pass Level 20 and Back Track
Listened to all BERL's tutorials
Played one round of Endless Boss
Pass Level 10 and Jolly Rog3r
Receive first visitor
Press the Do Not Press Button
First time on kite hill
Beat your first boss
Listen to the first tutorial
Complete Boss 101's main story
Pass Level 31 and Boss 101
Every boss piece defeated
Listen to all kite hill dialog
Complete weapon collection
Complete hat collection
Top Local Score on Tank War
Top Local Score on Breakdown
Top Local Score on Mazard
Adopt all the pets
Beat every level in record time
Receive all visitors
Press the Do Not Press Button Seven Times
Finish all hat quests
Pick Buzz Rainbow as a Pet Friend
Get to level 20 in Endless Boss Arcade Mode
Get to level 20 in Endless Boss Iron Bot Mode