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Sure, the current Max Master is 1500 for each tf form. Mastery can be gained a lot faster when using Modifications.

The unlocks are very similiar for all forms.

• 50:   Dmg +1
• 100: First TF Artefact
• 150: Dmg +1
• 200: Magic Scroll Unlock
• 250: Dmg +1
• 300: Potion Select Option
• 350: Dmg +1
• 400: Potion Unlock
• 450: Dmg +1 
• 500: Skill Evolution Unlock
• 600: Dmg +1
• 700: Animal Path Unlock
• 750: Start as Full TF
• 875: HP Gain +1
• 1000: New Passive 1
• 1100: Dmg +1
• 1250: Starting Skill Upgrade Select
• 1400: Dmg +1
• 1500: New Passive 2

Eternity Potion can make tf's permanent. They are already in the game but need to be unlocked.

The Corruption Mechanic mainly is there as a gameplay feature to make the player watch out for more than just their HP.

Feral forms are a often requested feature that may be implemented in the future. Currently I found no good way to implement them in a fun way.