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