Here is the full list of all 15 RPG Time: The Legend of Wright achievements.
Complete the tutorial dungeon.
Find 5 Mininja.
Find 10 Mininja.
Find 15 Mininja.
Talk to Medal King.
Get all swords.
Get all doodle sheets.
Get all food.
Get all burgers.
Inspect all pots and vases.
Inspect all cutout photo stands.
View 30 things in Help Mode.
Complete The Subterrane Search Party.
See all Title Screen events.
Collect all 7 Shards of Light without eating any.