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