Here is the full list of all 63 One Finger Death Punch 2 achievements. It takes around 20-25 hours to unlock all of the achievements on Windows.
Kill 250 bosses
Enter the Cloud Bonus Stage
Unlock 20 trophies
Spirit attack 500 times
Complete the land of temples
Use a revenge token
Enter the Pixel Bonus Stage
Play survival mode 10 times
Complete 150 levels
Get 35 skill points
Complete the sky lands
Max out 10 skills
Kill using a chainsaw 1000 times
Complete the ice lands
Catch a weapon 100 times
Kill 1000 brawlers
Complete 100 levels
Unlock 10 trophies
Complete the lava lands
Use skills 500 times
Get 3 stars 99 times
Kill 1000 blue enemies
Defeat 10 nemesis
Complete the swamps
Kill using a weapon 2000 times
Kill 1000 green enemies
Get 10 revenge tokens
Kill using a power weapon 1000 times
Unlock survival tower tier 5
Get a dance party
Kill 320 brawlers
Kill with ball of death 250 times
Achieve 10000 kill count
Get 4 stars 50 times
Complete the forest
Kill 5000 grey enemies
Achieve 5000 kill count
Tornado kick 15 times
Get 5 stars 25 times
Achieve a 150 hit combo
Complete tutorial level 16
Get perfect 5 times
Complete the alien crash site
Complete the wastelands
Complete 10 stages in Johnny's Minefield
Collect 10 boogers in Flick or Eat
Enter the background music test
Enter the computer room
Summon the Who's The Daddy guy
Enter the SDG Bonus Stage
Enter the Epic Bonus Stage
Unlock tier 10 in Normal Survival
Unlock tier 5 in Blind Survival
Unlock tier 10 in Blind Survival
Unlock tier 5 in No Luca No Survival
Unlock tier 10 in No Luca No Survival
Unlock tier 5 in Baby Survival
Unlock tier 10 in Baby Survival
Beat the Bonus Pixel level on the Map
Beat the Bonus Cloud level on the Map
Beat the last level on the Map
Beat the last level in the Gauntlet Normal
Beat the last level in the Gauntlet Blind