Here is the full list of all 32 Millennium 2 - there are Take Me Higher achievements.
50+ items found
Find 5+ secret rooms
Create Your Government List
Complete 1 quest
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
Repair Gravitron
Tame 30+ Enemies with Jezabel
Pass Gigantine's Lair
Kill Gigantine
Kill Trickster King
Kill 1+ enemy with Piu-Piu
Kill 50+ Enemies with Gravitron's Laser
Kill 50+ enemies with Abu
Kill 200+ Enemies with Abu
Complete 6+ quests
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 Ooze King
Kill Scorpion King
Kill Lion King
Kill Gorilla King
Kill Imp King