26/27 Baby's Super First Adventure
Go to the Yeti boss in zone 3 and drop down to it from the rainbow that goes overhead.
Nevermind! I got it!
Btw thanks Ayrilana, but that is for World 2 I believe.
For anyone who is wondering the last thing I was missing was in Zone 2. It turns out that to get the achievement, after you break the cage you need to STAY on the tree stump before it warps you to the next zone. So don’t go running around!