Here is the full list of all 52 Headsnatchers achievements.
Complete Zombie mode in hard
Play Zombie mode in hard
Complete Zombie mode in normal
Unlock all stickers
Play 100 hours
Unlock 10 new maps
Play TagTeam mode 25 times
Play TagTeam mode 10 times
Finish the first TagTeam match
Play the TagTeam mode for the first time
Win Tornado mode 100 times
Win Tornado mode 50 times
Win 50 online matches
Play for 50 hours
Play Zombie mode in normal
Unlock all maps
Play for 24 hours
Win 15 online matches
Play for 10 hours
Win your first online match
Unlock 5 new maps
Unlock 50 stickers
Choose the chest 15 times
Play Roulette mode 20 times
Choose the car 15 times
Unlock all heads
Unlocks 30 heads
Unlock 10 heads
Choose the chest for the first time
Choose the car for the first time
Win your first Roulette mode
Meet Charly Badulaque
Play Roulette mode for first time
Unlock your first head
Win Tornado mode 15 times
Unlock 15 stickers
Win Tornado mode once
Finish the fifth floor in Zombie mode
Complete Zombie mode in easy
Play for 2 hours
Finish the fourth floor in Zombie Mode
Finish the third floor in Zombie mode
Finish the second floor in Zombie mode
Finish the first floor in Zombie mode
Unlock your first map
Play for 30 minutes
Finish your first Zombie stage
Unlock your first sticker
Play Zombie mode for the first time
Play Zombie mode in easy
Start the game for first time
Play online mode for the first time