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