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.
Reach max level on one ship module.
Fire at least 150 rounds in one burst, killing at least 10 enemies.
Complete at least 100 missions.
Kill a Charger with a resupply pod.
Extract at least 15 rare samples from a mission as a team.
Throw back a live grenade.
Upgrade all ship modules at least 1 level.
Extract with at least 15 common samples.
Defeat a Bile Titan
Kill a bug warrior with a shotgun within 1 meter.
Be injured in all limbs at the same time.
Kill 5,000 enemies.
Play at least 50 missions.
Extract with a full team on a Hard difficulty or more mission.
Complete a Stalker Hive tactical objective.
Defeat a Hulk.
Complete 10 tactical objectives.
Kill 25 enemies with one stratagem.
Heal another player using stims.
Complete a mission but fail to extract.
Kill a target at a distance of over 100m.
Extract after the timer reaches zero.
Customize your Helldiver with new cape, armor, and helmet.
Extract from a mission during nighttime.
Fly at least 25 meters from the shockwave of an explosion.
Play 1 Bot Mission.
Play a planet defense mission.
Kill 150 enemies during the same mission.
Play 1 Bug 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.
Have 6 orbital barrage stratagems in the same place at the same time.
Kill 100 enemies using fire damage during the same mission.
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.