Here is the full list of all 27 PixelJunk Shooter Ultimate achievements.
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 'Terra Kingpin'
Kill over 1000 enemies
Defeat 'The Colonizer'
Purchase an item in Online Battle
Play the game at 11:11
Defeat 'ALF: 0N50'
Kill over 500 enemies
Defeat 'Frost Grubber'
Cool your ship down after being set on fire, then stay alive for 5 seconds
Collect your first suit
Rescue all the scientists within an Episode
Find all of the secret areas within an Episode
Collect all the hidden treasure within an Episode
Defeat 'Giant Spitter'
Kill over 100 enemies
Build a combo of 32 or over
Find your first secret area
Collect all other trophies
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