Here is the full list of all 32 Inline achievements.
Drop a shape outside of the grid
Completed 3 lines in 9 moves
Play Custom Mode
Beat your own highscore 3 times
Reach a combo of 4
Reach max level 10
Reached more than 9000 score in total
Reach streak of 5
Lose with no lines cleared
Skip when no more skips are left
Reach level 5 without skips
20 skips used
Reach combo of 3
Skip a single block
Find the option hidden in the options menu, and enjoy them "soft-body physics"
Try to access debug features and meet their guardian
Use the Gameboy command in the console and enjoy tastelessly emulated graphics from the past
Repeatedly press ESC at the main menu to display the game with inversed colors
Type RAIN at the main menu and let the rain work its magic
50 lines cleared in one session
Rotate a shape that will not change the orientation
Reach streak of 3
Spin one shape 20 times
Reach level 5
50 shapes placed
Click and hold main menu title for 5 seconds
Lose after using 5 skips in a row
Play 20 normal games
1000 lines cleared
Reach 600 score in 50 moves
Find every easter egg
Push an AI to crash the game