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