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