Here is the full list of all 49 Atelier Ryza: Ever Darkness the Secret Hideout achievements.
Earned all trophies.
Became a Braver.
Obtained all recipes.
Created an item with Item Level 99.
Got Ryza's alchemy level to 99.
Wrote a record of every exploration.
Got Ryza's battle level to 50.
Activated everyone's Fatal Drive.
Created a bottle with Gathering Synthesizer Level 51.
Defeated the Queen of Shadows.
Defeated the Mirage Master.
Defeated the Eternal Sculpture.
Defeated the King of Storms.
Defeated the Savage Assassin.
Obtained the Revelation Book.
Completed requests to get Peter to interview you.
Found all treasure chests.
Defeated all 5 Great Elements.
Saw everyone move on to chase their dreams.
Created the Crimson Stone and saved Kurken Island.
Found and installed all Power Reactors.
Defeated the Noble Paladin.
Defeated the Queen of Darkness.
Saved the goat you met on your travels.
Helped create Rasen Pudding.
Found one treasure chest.
Entered the Kurken Bunker.
Created the Bomb Rod.
Visited the Holy Tower of Pynnor and learn the truth.
Installed the Multiplicauldron at the secret hideout.
Defeated the Shining Puni.
Helped Empel regain his former strength.
Spent the night camping in the Underworld.
Laid eyes on the Underworld.
Installed the Gathering Synthesizer at the secret hideout.
Learned about the history of Ryza and the others.
Installed a Power Reactor at the secret hideout.
Created the Bug Net.
Defeated the dragon at the old castle.
Created the Hammer.
Created the Fishing Rod.
Wrote a record of one exploration.
Built a secret hideout for everyone.
Witnessed the rise of a strange beast.
Attended a tea party with Ryza and Klaudia.
Created the Woodcutter's Axe.
Created the Reaper's Scythe.
Synthesized for the first time.
Visited the mainland for the first time.