I noticed there are several locked titles, that I don't seem to find info on how/where to get them.

For example:

• Flower Power - Evy has flower power! Looking for "flower" in the achievement list, only gives the "Flower Child" achievement and title, but not the Flower Power one.

• Holiday Cheer - Evy is full of holiday cheer Same with this one, looking for holiday or cheer in achievements doesn't come up with anything with this title as a prize.

• With a cherry on top - Evy with a cherry on top Same with this.

Anyone has any info where to find a list with how to get these (and probably some others too)? Or ar the achievements named something totally different? Or are they prizes for something else than achievements?

Yeah from my knowledge there isn't a spot that provides all that information, though with some searching I did, I found the wiki has a page of forum titles that list their unlock conditions. https://subeta.fandom.com/wiki/Forum_Titles

Also achievements might not share any words that appear in the forum title prize. There is titles that are not connected to an achievements.

As for the ones you mentioned Flower Power = I couldn't find this one at all

Holiday Cheer = apparently this is connected to a retired achievement called Celebrate!

With a cherry on top = Gourmand (8,000) which is have one pet eat 8,00 unique foods