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