Full list of all 17 Probo Rush achievements.
The base game contains 12 achievements, and there is 1 DLC pack containing 5 achievements.
Defeat the fifth boss
Defeat the fourth boss
Defeat the third boss
Defeat the second boss
Defeat the first boss
Defeat the sixth boss
Defeat the seventh boss
Defeat the eigth boss
Defeat the ninth boss
Defeat the tenth boss
Defeat all bosses
Beat Boss rush with health set to 1
Defeat the 11th boss
Defeat the 12th boss
Defeat the 13th boss
Defeat the 14th boss
Defeat the 15th boss