Here is the full list of all 32 Inline achievements.
1000 lines cleared
Lose after using 5 skips in a row
Play 20 normal games
Find every easter egg
Push an AI to crash the game
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
Spin one shape 20 times
Click and hold main menu title for 5 seconds
Completed 3 lines in 9 moves
Reach max level 10
Reach 600 score in 50 moves
Reach streak of 5
Lose with no lines cleared
Play Custom Mode
Reached more than 9000 score in total
Drop a shape outside of the grid
Skip a single block
Beat your own highscore 3 times
20 skips used
Skip when no more skips are left
Reach combo of 3
Reach a combo of 4
50 lines cleared in one session
Rotate a shape that will not change the orientation
Reach level 5
Reach level 5 without skips
50 shapes placed
Reach streak of 3