Secret merlin trial?

[Miro Fox]

I have all of them done on the map, but it didn't give me an achievment?

are there any unlisted trials on the map?

[cridus]

well, I'm pretty sure they're unlisted until you find them for the first time :V
so, go around flying and casting revelio repeatedly until you find them all.
if you really end up having them all completed and no achievement, you can still use "steam achievements manager" to unlock it manually. look it up with google.

[Snobby Hobo]

There are many issues with the 100% achievements unfortunately. Decent odds you might have run into one.

[ProestUnicorn]

You have to physically see the trial in order for it to show on map, try flying around on a broom and using revellio.

[Zaros]

When I was 100%'ing them, I encountered the same thing. Then, I realized that I had to use the broomstick and fly across the whole map, using Revellio. There are about 5-6 other Merlin trials that don't appear on the map, which kind of explains why many people struggle getting that achievement...

You may end up having the slightest sliver of land that you haven't unlocked, which hides the trial from your map.

[American man 17]

just keep spamming reveilo while on the broom while flying around the map

[flclafi]

Another thing that is kind of helpful, if you fully zoom out the map it tells you the total amount of everything in highlands, and if you zoom in once from there you can hover over each section to see what you still need in them.

The only thing that isn't tracked are Butterfly Collection chests.