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