Here is the full list of all 32 Millennium 2 - there are Take Me Higher achievements.
Finish the game in less than 9 hours in Hard Mode
Complete the game fully (all quests, secret rooms and animal kings)
Hard Mode Completed
All quests completed
Kill Gigantine
Kill Zombie King
Kill all animal kings
Kill Trickster King
Kill Ooze King
All secret rooms found
Kill 200+ Enemies with Abu
Kill 50+ Enemies with Gravitron's Laser
Repair Gravitron
Held more than 30 000 Gold
Kill Lion King
Kill Imp King
Kill Queen Twin
Kill Scorpion King
Pass Gigantine's Lair
Kill 1+ enemy with Piu-Piu
Kill Gorilla King
Tame 30+ Enemies with Jezabel
Kill 50+ enemies with Abu
Complete 8+ quests for Dee
Complete 6+ quests
Find 5+ secret rooms
Spend 20+ hours on the game
Play 1+ hour
Complete 1 quest
Create Your Government List
50+ items found
Find 1+ secret room