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