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