Puzzle - LINES AND KNOTS

If you right click the top left corner of the screen 10 times (not super picky on being at the corner), a dialog box opens. Enter the level number for the corresponding achievement (10, 20, etc--'END GAME!' is level 100) and complete that level. Achievement checks completion of the landmark levels, but none of the levels in between.

Dev sauce on level skip: https://steamcommunity.com/app/1227750/discussions/0/2840039920169756103/

You may be able to shorten this by skipping to the decade+1 levels (i.e. level 11, 21, etc), but this hasn't yet been confirmed by multiple users

There is a debug feature that developer left in-game to get all achievements instantly.

In order to do that just hold "K" button and press from 0 to 9 on your keypad after that just press "S" button without unholding "K" button.

Enjoy your free hundo.