Here is the full list of all 36 The Land Beneath Us achievements.
Complete Quest "Getting Started".
Complete Quest "Mother's Soul".
Complete Quest "The Chained Witch".
Complete Quest "Venom Horseman".
Complete Quest "Under The Swamp".
Complete Quest "Trouble Trio".
Complete Quest "10‚000‚000 Volt Thunderbolt".
Complete Quest "Pride and Prejudgment".
Complete Quest "Get Serious".
Complete Quest "Family Reunion".
Complete Quest "New Moon".
Complete Quest "Waxing Crescent".
Complete Quest "First Quarter".
Complete Quest "Waxing Gibbous".
Complete Quest "Full Moon".
Complete Quest "Blood Moon".
Complete Quest "Roguelike".
Complete Quest "Unyielding I".
Complete Quest "Unyielding II".
Complete Quest "Unyielding III".
Complete Quest "Learning | Offensive".
Complete Quest "Learning | Defensive".
Complete Quest "Learning | Techinical".
Complete Quest "Processing | Plasma".
Complete Quest "Processing | Infliction".
Complete Quest "Processing | Recovery".
Complete Quest "Processing | Traps".
Complete Quest "Processing | Enhance".
Complete Quest "Processing | Overload".
Complete Quest "Finalize | Plasma".
Complete Quest "Finalize | Infliction".
Complete Quest "Finalize | Recovery".
Complete Quest "Finalize | Traps".
Complete Quest "Finalize | Enhance".
Complete Quest "Finalize | Overload".
Complete Quest "Hidden Sacred Sword".