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