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