Here is the full list of all 27 PixelJunk Shooter Ultimate achievements.
Kill over 1000 enemies
Defeat 'ALF: 0N50'
Defeat 'Frost Grubber'
Kill over 500 enemies
Build a combo of 32 or over
Rescue all the scientists within an Episode
Purchase an item in Online Battle
Collect your first suit
Find all of the secret areas within an Episode
Collect all the hidden treasure within an Episode
Defeat 'Giant Spitter'
Kill over 100 enemies
Cool your ship down after being set on fire, then stay alive for 5 seconds
Find your first secret area
Collect all other trophies
Defeat 'The Colonizer'
Defeat 'Terra Kingpin'
Defeat 'The Guardian Of The Deep'
Collect all the treasure hidden on Apoxus Prime
Rescue all the scientists
Find all of the secret areas
Complete the secret level 'The Road To Dawn'
Play the game at 11:11
Win your first league battle
Win 10 League Battles
Advance to a higher league through Online Battle.
Win a League Battle with your opponent's final survivor total as 0