Here is the full list of all 18 Flippin Kaktus achievements.
Finish the tutorial
Get through the Rave level without dying
Finish Part I
Play all special tracks
Kill 15 enemies with a door
Kill 50 enemies with fire thorns
Try every stimulant possible
Open the mysterious barrel
Use 3 mystery vials
Kill 10 enemies with reflected bullets
Endure 20 burro kicks
Destroy 10 vehicles
Kill 500 cartel thugs
Find all photo pieces
Find all story memos
Finish the game
Finish the game on Hardcore difficulty
Finished the game on No chance difficutly