Here is the full list of all 88 FatalZone achievements.
Defeat 300,000 enemies
Hold out for 29 minutes in a raid while playing as a Survivor
Complete a raid with the Biotech class
Use the Airstrike item 15 times
Hold out for five minutes in a raid while playing as a Pyro
Reach lvl. 30 in a raid with the Pyro class
Defeat 1,000 enemies with the Pyro class
Hold out for ten minutes in a raid while playing as a Pyro
Reach lvl. 20 in a raid with the Biotech class
Defeat 1,700 enemies with the Biotech class
Hold out for 10 minutes in a raid while playing as a Biotech
Gather 10,000 resources in total with the Tank class
Defeat 100,000 enemies
Reach lvl. 60 in a raid with any class
Complete a raid with the Scavenger class
Use the Large Shock Grenade item five times
Hold out for ten minutes in a raid while playing as a Tank
Defeat 40,000 enemies
Reach lvl. 15 in a raid with the Biotech class
Defeat 1,000 enemies with the Tank class
Hold out for ten minutes in a raid while playing as a Scavenger
Defeat 1,000 enemies with the Scavenger class
Use the Airstrike item five times
Hold out for five minutes in a raid while playing as a Brawler
Reach lvl. 20 in a raid with the Brawler class
Defeat 8,000 enemies with the Brawler class
Defeat 160 enemies with the Brawler class
Gather 18,000 resources in total with any class
Defeat 10,000 enemies
Hold out for twelve minutes in a raid while playing as a Survivor
Collect 8,000 coins in total
Defeat 17,000 enemies
Hold out for two minutes in a raid while playing as a Veteran
Take 5,000 damage in total with any class
Defeat 5,000 enemies
Reach lvl. 25 in a raid with the Veteran class
Reach lvl. 40 in a raid with any class
Destroy 77 crates
Take 2,000 damage in total with any class
Defeat 1,500 enemies
Destroy 20 crates
Reach lvl. 10 in a raid with any class
Hold out for seven minutes in a raid while playing as a Survivor
Use the Super Magnet item once
Defeat 750 enemies
Kill your first enemy
Defeat 33 enemies
Take 1 damage with any class
Hold out for one minute in a raid with any class
Collect 1,000 coins in total
Complete a level at the Forest location while playing as a Scavenger with the Legend mutator
Complete a level at the Forest location while playing as a Saboteur with the Legend mutator