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