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)
Held more than 99,000 Gold
Kill 1000+ enemies with The Bear
Kill all animal kings
Kill Urchin Nation
1000+ fights
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
Find 40+ XP baskets
Go through the Grand Rift
Spend 40+ hours on the game
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
Find 5+ secret rooms
Kill Perfect Chopper
Get 50+ Gold from a gold sack
Recruit Wolfgang
Kill Golem Overking
600+ hits with Salome's Hands
Play 1+ hour
Complete 1 quest
Kill Gorilla Lord
Find 1 secret room
3+ hits with James' Hands
400+ hits with Marine's hands
Reach lvl 6 in Bare Hands with Benoit