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