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