Here is the full list of all 39 HELLDIVERS achievements.
Kill 100,000 enemies.
Achieve the rank of Grand Lord (Rank 25).
Fully upgrade all non DLC Weapons and Stratagems.
Kill 10,000 enemies.
Kill a Bug Tank, Bug Behemoth, or Cyborg IFV by having the extraction shuttle land on it.
Take part in a successful defense of a capital city by completing at least one mission.
Defeat a Bug Hive Lord.
Defeat an Illuminate Great Eye.
Kill an Illuminate Obelisk while it is closed.
Complete a mission with over 300 shots fired and 80% accuracy or better.
While in melee range from a Cyborg Warlord, use the "NO" communication command.
Complete a difficulty 7 or higher mission against the Cyborgs without taking damage from any enemy.
Complete a difficulty 7 or higher mission without triggering any alarms.
Kill a Bug Tank with a Resupply Stratagem Hellpod.
Kill a Bug or Illuminate assassination target by running it over with the APC or HAV.
In a 4 player game, on a Friday, have all players sitting in an APC or HAV at the same time.
Complete a difficulty 10 or higher mission without a single death.
Extract from a difficulty 8 or higher mission with 4 players where all 4 get on the shuttle.
Complete all missions on a planet with difficulty 10 or higher.
Defeat a Cyborg Siegemech.
Successfully complete an escort objective where all 4 NPCs survive.
Take part in a successful final assault on an enemy's home planet by completing at least one mission.
Complete a mission using only Stratagems.
Join another game through the matchmaking system.
Use the Reinforce Stratagem while downed and the last Helldiver alive on a difficulty 8 or higher mission with 4 players.
Achieve the rank of Captain (Rank 13).
Complete a difficulty 4 or higher mission in 5 minutes or less.
Do 25 capespins in a row, without moving, while on the ship bridge.
Complete a volcanic type planet of difficulty 5 or more.
Destroy a Bug Nest, Cyborg AA, or Illuminate Beacon with anything but the NUX-223 Hellbomb.
Achieve the rank of Sergeant (Rank 7).
Play at least once on a desert, a forest, and a snow planet.
Face each new enemy once.
Complete at least one planet in a successful Galactic Campaign.
Play at least once against all enemy races.
Kill 7 enemies within a very short time using only your primary weapon.
Complete a mission.
Customize your character.
Finish the Training.