Here is the full list of all 74 Infinite Adventures achievements.
Defeat Lyra Gaiden
Defeat Tiberius Gaiden
Finish Game : Evil Ending
Finish Game : Good Ending
Defeat the Ancient of Chaos
Summons Acquired 50%
Bestiary 100%
Defeat Vith Uriel
Complete Chapter 5
Let Love Interest go
Defeat Yndra
Defeat Kentu Asura
Jacinda Joins
Defeat The Prophet
Zander and Tonya Join
Victoria Joins
Defeat Xianglu
Complete Chapter 4
Regulus and Ejlora join
Hunt Rank S
Gather Rank S
Decipher Rank S
Rescue Victoria
Defeat Vith Zoral
Mine Rank S
Search Rank S
Item Recipes Learned 50%
Dinari Earned 1,000,000
Bestiary 50%
Puzzle Rooms Completed 50%
Unlock Rank S
Wild Portals Unlocked 50%
Complete Chapter 3
Defeat Lex Zero
Yokai Killed 50
Complete 50% of Quests
Defeat Shi-Lorath
Complete Chapter 2
Defeat Sorcerer Modari
Steps Taken 10,000
Enemies Killed 1000
Enchantments Known 50%
Yokai Killed 25
Defeat Jacinda Brightflame
Team Kessens Used 50
Summons Used 50
Dinari Earned 100,000
Enemies Killed 500
Complete Chapter 1
Defeat Jormandr
Team Kessens Used 25
Summons Used 25
Defeat Butterbean
Steps taken 1,000
Complete Prologue
Rescue Royce
Follow Love Interest into portal
Rescue Main Character
Royce Joins
Complete All Quests and talk to Foster
Complete All Quests
Enchantments Known 100%
Item Recipes Learned 100%
Wild Portals Unlocked 100%
Puzzle Rooms Completed 100%
Summons Acquired 100%
Defeat The Ancient of Chaos Gaiden
Defeat Zander Gaiden
Defeat Balthazzar Gaiden
Defeat Lilith Gaiden
Defeat Agamon Gaiden
Defeat Svolkoroth Gaiden
Defeat Mordekai Gaiden
Defeat Justicar Gaiden