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