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