Apparently level 25 but who knows with this game.
this is the only level that starts with this message on the screen :
The winner is the one who can wait as mentioned in the other solutions comments and the other solution this sums it up better
after seeing that message you will see UFO lookin jellies with light beams coming out their butts. in an orb shape there is a brighter part and a duller part. i didnt risk much for moving in the duller part but sometimes i had no choice and never died. the brightest part will kill you, instantly if you move so you must stand still, let them pass and then move on. when you see a lower path, take it. i mean path and not just a singular rock.(i think its after 2 or 3 jellies after the levels start) if you dont take it you will have to turn back around. (yawn) shortly before reaching the second check point the achievement popped.
if you get caught by jelly or die walking off an edge gotta PAUSE, click MENU and LOAD the game. game is so glitchy it might count a fall death as being caught and you do not want to play this game again, trust me. someone in the comments for this game said it reminded them of NES. if NES was this bad, id have been an athlete.