Here is the full list of all 32 Millennium 2 - there are Take Me Higher achievements.
Kill Lion King
Kill Gigantine
Kill Gorilla King
Kill Ooze King
Pass Gigantine's Lair
Kill 50+ enemies with Abu
Tame 30+ Enemies with Jezabel
Complete 6+ quests
Find 5+ secret rooms
50+ items found
Spend 20+ hours on the game
Complete 1 quest
Create Your Government List
Find 1+ secret room
Finish the game in less than 9 hours in Hard Mode
Held more than 30 000 Gold
Repair Gravitron
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
Play 1+ hour
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 Imp King