Here is the full list of all 27 Ballpoint Universe - there are Infinite achievements.
Welcome to the Spring!
Passed Wave 8 in infinite mode.
Completed "Training on the rocks" flawlessly!
Completed "Target Practice" flawlessly!
Completed "The Battleship" flawlessly!
Completed "Brethren" flawlessly!
Completed "Treetop Battle" flawlessly!
Completed "Counter Attack" flawlessly!
Completed "The Owls" flawlessly!
Completed "The Demented Doodles" flawlessly!
Completed "Face Off" flawlessly!
Completed "The Lost Fortress" flawlessly!
Completed "Defenders of the Elder" flawlessly!
Completed "Stolen Artifact" flawlessly!
Completed "Clearing a Path" flawlessly!
Completed "Stone Dragon" flawlessly!
Passed wave 16 in Infinite Mode.
Passed wave 24 in Infinite Mode!
Passed wave 36 in Infinite Mode.
Passed wave 48 in Infinite Mode.
Passed wave 60 in Infinite Mode! Wow!
Things might get weird from here.
You are a good enough idea.
The hotspot for creativity!
The elder revealed the truth of this age for you.
The boss of the logicians, your enemy?
The end of a page.