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