Here is the full list of all 43 Millennium 4 - there are Beyond Sunset achievements.
Spend 40+ hours on the game
Complete the game fully (all quests, secret rooms and animal kings)
Hard Mode Completed
Finish the game in less than 13 hours in Hard Mode
Register Old Suzuki (just in time!)
All secret rooms found
All quests completed
Complete Q9 (Find Jacque's Hair Potion)
Kill all animal kings
Kill Legendary Warrior
Kill Kingdom of Weapons
Kill Soil of War
Kill Urchin Nation
Kill 1000+ enemies with The Bear
Kill more than 1000 enemies with Bokden
Convince the Bear to join
Pass the Crystals trial
Kill 15+ groups of Tianas during the second trial
Defeat the Tyranosaurus
20+ secret rooms found
Kill Shooking
Find 40+ XP baskets
Go through the Grand Rift
150+ items found
Held more than 99,000 Gold
99+ hits with Bokden's Hands
Recruit Bokden
Kill the King
Complete 6+ quests
Find 5+ secret rooms
Kill Perfect Chopper
Recruit Wolfgang
Kill Golem Overking
Get 50+ Gold from a gold sack
Play 1+ hour
Complete 1 quest
Kill Gorilla Lord
600+ hits with Salome's Hands
Find 1 secret room
3+ hits with James' Hands
400+ hits with Marine's hands
Reach lvl 6 in Bare Hands with Benoit
1000+ fights