Here is the full list of all 15 Square Journey achievements.
I won't die anymore. Use Armored for the first time
Hey son, how are you? 500 Experience
I wonder if my daddy still lives. 400 Experience
Oh the arc, good times. 300 Experience
I could be in guinness. 200 Experience
I'm just tired, let me die. 100 Experience
Too old for this stuff. 60 Experience
Oh that time i had hair. 30 Experience
You're so boring. 15 Experience
Ooohhnn, so cute! 5 Experience
First of many. 1 Experience
I'm free! Win level 7
Chronos is jealous. Slow down time for the first time
It's not as easy as it looks. Win level 11
So beautiful. Finish Square Journey