Here is the full list of all 36 Otem's Defiance achievements.
Play through the first stage and survive
Meet the first batch of Ringods
Meet the second batch of Ringods
Meet the third batch of Ringods
Fight with the High Priestess for the first time
Survive a stage with obstacles for the first time
Use the speed power-up for the first time
Use the shield power-up for the first time
Use the rage power-up for the first time
Use the heal power-up for the first time
Survive all the Crystal Ring stages
Survive all the Vortex Ring stages
Survive all the Treetop Ring stages
Survive all the Molten Ring stages
Beat the game
Vanquish 100 Ringods
Vanquish 500 Ringods
Vanquish 30 Faiths
Vanquish 30 Paranoias
Vanquish 30 Confussions
Vanquish 30 Envy's
Vanquish 30 Frustration
Vanquish 30 Disgusts
Vanquish 30 Obsessions
Vanquish 30 Opressions
Vanquish 30 Pains
Vanquish 30 Frenzy's
Vanquish 30 Uncertainties
Vanquish 30 Griefs
Vanquish 30 Hatreds
Vanaquish 30 Rejections
Vanquish 30 Madnesses
Vanquish 30 Anxieties
Defeat the Chaman for the first time
Defeat the Chaman for the second time
Defeat the Chaman for the third time