Here is the full list of all 38 HELLDIVERS 2 achievements. It takes around 50-60 hours to unlock all of the achievements on Windows.
Kill 100 enemies using fire damage during the same mission.
Shoot off both arms on a Hulk and then extract while it's alive.
Play a planet defense mission.
Reach max level on one ship module.
Extract with at least 15 common samples.
Play at least 50 missions.
Kill 25 enemies with one stratagem.
Complete an Extreme difficulty mission or higher without anyone dying.
Kill 5,000 enemies.
Throw back a live grenade.
Fire at least 150 rounds in one burst, killing at least 10 enemies.
Kill a bug warrior with a shotgun within 1 meter.
Play 1 Bot Mission.
Provide assisted reload for a teammate.
Defeat a Hulk.
Extract at least 15 rare samples from a mission as a team.
Defeat a Bile Titan
Complete 10 tactical objectives.
Complete a Stalker Hive tactical objective.
Extract with a full team on a Hard difficulty or more mission.
Extract after the timer reaches zero.
Complete a mission but fail to extract.
Kill 150 enemies during the same mission.
Fly at least 25 meters from the shockwave of an explosion.
Heal another player using stims.
Customize your Helldiver with new cape, armor, and helmet.
Extract from a mission during nighttime.
Kill a target at a distance of over 100m.
Play 1 Bug Mission.
Complete a full Hard difficulty mission or higher without anyone firing their primary or support weapon.
Complete a full Extreme difficulty Blitz mission and extract in under 6 minutes.
Kill a Charger with a resupply pod.
Complete at least 100 missions.
Have 6 orbital barrage stratagems in the same place at the same time.
Be injured in all limbs at the same time.
Upgrade all ship modules at least 1 level.
While using a jump pack, knock yourself into a ragdoll state.
Complete Basic Training.