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