Here is the full list of all 22 InfiniPicross achievements.
15x15 or Bigger Completed
25x25 or Bigger Completed
50x50 or Bigger Completed
99x50 (or 50x99) or Bigger Completed
Use The Workshop
Set a Seed
A Certain Familiarity
Create a Theme
Reset a Filled Grid
100 Solved
50 Solved
25 Solved
10 Continues in a Row
5 Continues in a Row
10 Solved
10x10 or Bigger Completed
5 Solved
One Continue
First Solve
3x3 or Bigger Completed
5x5 or Bigger Completed
Change Theme