Here is the full list of all 43 Millennium 4 - there are Beyond Sunset achievements.
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 Urchin Nation
Kill 1000+ enemies with The Bear
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
Kill more than 1000 enemies with Bokden
1000+ fights
Find 40+ XP baskets
Go through the Grand Rift
150+ items found
99+ hits with Bokden's Hands
Recruit Bokden
Kill the King
Kill Legendary Warrior
Kill Kingdom of Weapons
Kill Soil of War
Complete 6+ quests
Kill Perfect Chopper
Find 5+ secret rooms
Get 50+ Gold from a gold sack
Recruit Wolfgang
Held more than 99,000 Gold
600+ hits with Salome's Hands
Kill Golem Overking
Complete 1 quest
Kill Gorilla Lord
Play 1+ hour
Spend 40+ hours on the game
Find 1 secret room
400+ hits with Marine's hands
3+ hits with James' Hands
Reach lvl 6 in Bare Hands with Benoit