Here is the full list of all 31 Lotia achievements.
Complete combat tutorial with First Mate Riri.
Defeat the Dominion Soldiers and Casters in Nimbus.
Elementalist joins the party.
Wordsmith joins the party.
Rescue the Dream Walker, complete the Rude Bastion.
Obtain a Crux Shard.
Obtain the flare gun.
Collect all Section C tomes.
Collect all Section D tomes.
Collect all Section H tomes.
Collect all Section P tomes.
Collect all Section R tomes.
Collect all Section S tomes.
Collect all Section T tomes.
Collect all Section X tomes.
Collect all Section Y tomes.
Collected all journal entries!
Awaken Myxaster.
Awaken Luidia.
Awaken Fromia.
Level the entire party to 50.
Complete the Weeping Woods.
Complete the Vagary Lodge.
Complete the Temple of the Dream Walkers.
Complete the Unknown Path of the Hand.
Complete the Unknown Path of the Foot.
Complete the Unknown Path of the Senses.
Complete the Unknown Path of the Eye.
Complete the Unknown Path of the Ear.
Complete the Dominion Fortress.
Take Rory through the Courtyard of Awakening, and enter the Twilight Grove.