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