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