Here is the full list of all 49 Atelier Ryza: Ever Darkness the Secret Hideout achievements.
Earned all trophies.
Obtained all recipes.
Created a bottle with Gathering Synthesizer Level 51.
Defeated the Queen of Shadows.
Defeated the Eternal Sculpture.
Saw everyone move on to chase their dreams.
Became a Braver.
Defeated all 5 Great Elements.
Created an item with Item Level 99.
Got Ryza's alchemy level to 99.
Got Ryza's battle level to 50.
Wrote a record of every exploration.
Created the Crimson Stone and saved Kurken Island.
Defeated the Queen of Darkness.
Activated everyone's Fatal Drive.
Obtained the Revelation Book.
Defeated the Savage Assassin.
Defeated the Noble Paladin.
Defeated the Mirage Master.
Completed requests to get Peter to interview you.
Entered the Kurken Bunker.
Found all treasure chests.
Defeated the King of Storms.
Defeated the Shining Puni.
Found and installed all Power Reactors.
Created the Bomb Rod.
Visited the Holy Tower of Pynnor and learn the truth.
Installed the Multiplicauldron at the secret hideout.
Created the Bug Net.
Helped create Rasen Pudding.
Saved the goat you met on your travels.
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.
Wrote a record of one exploration.
Installed a Power Reactor at the secret hideout.
Defeated the dragon at the old castle.
Found one treasure chest.
Created the Hammer.
Created the Fishing Rod.
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.