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 using a power weapon 1000 times
Kill 320 brawlers
Achieve a 150 hit combo
Kill with ball of death 250 times
Complete the swamps
Achieve 10000 kill count
Get 10 revenge tokens
Get perfect 5 times
Get 4 stars 50 times
Kill 5000 grey enemies
Complete the forest
Achieve 5000 kill count
Get a dance party
Get 5 stars 25 times
Tornado kick 15 times
Complete tutorial level 16
Complete 100 levels
Complete 150 levels
Unlock survival tower tier 5
Unlock 10 trophies
Unlock 20 trophies
Complete the lava lands
Complete the ice lands
Complete the alien crash site
Complete the sky lands
Complete the wastelands
Complete the land of temples
Use a revenge token
Get 35 skill points
Max out 10 skills
Get 3 stars 99 times
Use skills 500 times
Kill 1000 brawlers
Kill 250 bosses
Kill 1000 green enemies
Kill 1000 blue enemies
Spirit attack 500 times
Defeat 10 nemesis
Catch a weapon 100 times
Kill using a weapon 2000 times
Kill using a chainsaw 1000 times
Play survival mode 10 times
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
Enter the Pixel Bonus Stage
Enter the Cloud 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