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