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 at least 100 missions.
Upgrade all ship modules at least 1 level.
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.
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.
Have 6 orbital barrage stratagems in the same place at the same time.
Reach max level on one ship module.
Play at least 50 missions.
Fire at least 150 rounds in one burst, killing at least 10 enemies.
Be injured in all limbs at the same time.
Extract with at least 15 common samples.
Play a planet defense mission.
Kill a Charger with a resupply pod.
Kill 5,000 enemies.
Throw back a live grenade.
Defeat a Bile Titan
Extract after the timer reaches zero.
Extract at least 15 rare samples from a mission as a team.
Provide assisted reload for a teammate.
Kill 25 enemies with one stratagem.
Kill a target at a distance of over 100m.
Complete 10 tactical objectives.
Play 1 Bot Mission.
Defeat a Hulk.
Customize your Helldiver with new cape, armor, and helmet.
Heal another player using stims.
Kill 100 enemies using fire damage during the same mission.
Kill a bug warrior with a shotgun within 1 meter.
Complete a mission but fail to extract.
Extract with a full team on a Hard difficulty or more mission.
Fly at least 25 meters from the shockwave of an explosion.
Kill 150 enemies during the same mission.
Play 1 Bug Mission.
Extract from a mission during nighttime.
Complete a Stalker Hive tactical objective.
Complete Basic Training.