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