No achievements specifically require finding hidden murals, but there's plenty of art-related content to collect. Make your way to the painting workshop through any of its three entrances, where you'll need to rebuild a statue and defeat the lampmaster for one of the tougher trophies. The workshop area connects to the northwest map section, which holds a family portrait you'll need the fly ability to reach.

For completion focused players, grab all 49 journals scattered through areas like spring meadows, flying waters, and ancient sanctuary. The endless tower should be your final stop, but watch out for axon enemies in gestral village along the way. Important to note that while collecting portraits and artwork is part of progression, the achievements focus more on story beats, boss fights against characters like paintress and simon, and thorough exploration of each zone.

Main areas you'll want to clear are lumiere first, then spring meadows followed by flying waters. Once you've got those done, head into ancient sanctuary but be ready for some tough fights especially against clea near the end.