Twin Robots: Ultimate Edition (US)

Right near the end there is a slope and it leads to a horizontal slasher (going left to right).

You need to stop on the slasher guard (the sheathe before the blade) and jump to the right. If you fall down the slope you will need to restart. You will know what I mean when you see it as it's the only horizontal one I'd seen up until this point.

You have to do this with both twins as one has to stand in the painter and the other stands on the button. FYI the button one has to step off for the roulette wheel to stop.

It pops when it's painted. SO you can go back left fall down the slope and finish the level. Whatever colour it's painted it will continue to be that colour for the rest of your game.

In level 20, towards the end of level, there is a paint machine. Get both robots here and put one in the chamber, while the other hits the button. This one starts at 48:39.

Here's a walkthrough video for all of the achievements: