Here is the full list of all 27 PixelJunk Shooter Ultimate achievements.
Rescue all the scientists
Collect all the hidden treasure within an Episode
Defeat 'The Guardian Of The Deep'
Play the game at 11:11
Defeat 'Terra Kingpin'
Defeat 'The Colonizer'
Kill over 1000 enemies
Defeat 'ALF: 0N50'
Build a combo of 32 or over
Kill over 500 enemies
Purchase an item in Online Battle
Rescue all the scientists within an Episode
Defeat 'Frost Grubber'
Collect your first suit
Find all of the secret areas 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
Collect all the treasure hidden on Apoxus Prime
Find all of the secret areas
Complete the secret level 'The Road To Dawn'
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