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