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