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