Here is the full list of all 36 Dead Island Riptide (JP) trophies - there are 20 bronze, 11 silver, 4 gold and 1 platinum.
Collect all other trophies
Rescue 20 NPCs that have been grabbed by monsters
Finish all quests in the game
Kill 25 monsters with a chainsaw
Kill 100 enemies using charge attacks
Find all pages from the guide book
Find all collectibles
Find all the volunteer's voice recordings
Find and kill all named champion monsters located in dead zones
Find 50% of collectibles
Find all the secret files
Kill 100 monsters with thrown melee weapons
Kill 100 monsters with a kick
Kill 100 monsters using the boat's speed boost
Obtain level 70
Obtain level 50
Kill 10 monsters with one mine
Kill the Twins
Finish hospital quests for Cecil
Finish quests for Dr. Kessler
Complete all the main quests cooperatively with any number of partners
Finish the game
Defeat Harlow
Enter the docks in Quarantine Zone
Make pact with Serpo
Survive the horde on the roof
Kill special enemies: Grenadier, Thug, Wrestler, Infected, Suicider, Screamer, Butcher, Floater.
Gain access to a long-range radio station
Clear out the cinema
Reach Henderson
Successfully defend the tunnel entrance
Install a total of 5 barricades during hub defense
Kill 50 monsters by smashing, decapitating or shooting them in the head
Mark 100 opponents which were then killed by your co-op partners
Find a boat for use in the jungle
Escape from the ship