Here is the full list of all 22 Avalanche 2: Super Avalanche achievements.
Fall in the laval 50 times
Kill 50 Dragons
Get a max-level Whirly follower in Endless Mode
Complete 45 missions
Get a max-level Speedster follower in Endless Mode
Get a max-level Hopster follower in Endless Mode
Use the climbing gloves 15 times
Surf 22 falling blocks without touching the ground
Beat Chicken Commander
Beat Mama Squid and a Sky Rider
Beat any boss at the end of the clouds (600ft)
Bank a total of 1,000 coins
Beat Big Mouth and Queen Birdie
Complete 15 missions
Fall in the lava 3 times
Bank a total of 100 coins
Beat any boss at the end of the cliffs (225ft)
Beat the Great Wizard Ohe
Defeat both bosses in any double boss battle!
Defeat every boss in the game
That's impossible. There's no way his height is over 3000ft!
Bank a total of 10,000 coins