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