Select

1. 
   Thanks to Select!Secret

   Steam withholds the description of a secret achievement.
   50%
2. 
   50 Select

   Select 50 times
   50%
3. 
   100 Select

   Select 100 times
   50%
4. 
   500 Select

   Select 500 times
   50%
5. 
   1000 Select

   Select 1000 times
   50%
6. 
   3000 Select

   Select 3000 times
   50%
7. 
   5000 Select

   Select 5000 times
   50%
8. 
   Just pencil

   Unlock 1 skin in Nomiss Mode
   67%
9. 
   A red pencil

   Unlock 2 skins in Nomiss Mode
   50%
10. 
    A rainbow pencil

    Unlock 3 skins in Nomiss Mode
    50%
11. 
    A cool mouse

    Unlock a skin in Time Attack: Start Lv. 1
    50%
12. 
    Mouse(mouse)

    Unlock a skin in Time Attack: Start Lv. 6
    50%
13. 
    A magic broom

    Unlock 1 skin in Survival Mode
    50%
14. 
    A dark broom

    Unlock 2 skins in Survival Mode
    50%
15. 
    Who!?

    Unlock 3 skins in Survival Mode
    50%
16. 
    Highlight(?)

    Unlock 1 skin in Nonstop Mode
    50%
17. 
    Easy to recognize

    Unlock 2 skins in Nonstop Mode
    50%
18. 
    Looks strong

    Unlock 3 skins in Nonstop Mode
    50%
19. 
    [Unrecognized]Secret

    Steam withholds the description of a secret achievement.
    50%
20. 
    ***** Flying Object

    Stage 50 clear in Survival Mode by the last skin
    50%

Names, descriptions and icons are the game’s own, as Steam publishes them; the share is how many owners have unlocked each, from Steam's global figures for 20 of them.