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