Full list of all 35 Dead Island: Riptide Definitive Edition achievements. It takes around 20-25 hours to unlock all of the achievements on Windows.
Finish the game
Complete all the main quests cooperatively with any number of partners
Kill 10 monsters with one mine
Rescue 20 NPCs that have been grabbed by monsters
Obtain level 70
Finish hospital quests for Cecil
Finish all quests in the game
Find and kill all the most dangerous monstrosities located in dead zones
Kill 100 monsters using the boat's speed boost
Find all the secret files
Find all collectibles
Find all the volunteer's voice recordings
Find all pages from the guide book
Kill 100 enemies using charge attacks
Kill the Twins
Kill 100 monsters with thrown melee weapons
Defeat Harlow
Enter the docks in Quarantine Zone
Make pact with Serpo
Kill special enemies: Grenadier, Thug, Wrestler, Infected, Suicider, Screamer, Butcher, Floater.
Survive the horde on the roof
Gain access to a long-range radio station
Clear out the cinema
Mark 100 opponents which were then killed by your co-op partners
Finish quests for Dr. Kessler
Reach Henderson
Successfully defend the tunnel entrance
Install a total of 5 barricades during hub defense
Find 50% of collectibles
Kill 25 monsters with a chainsaw
Kill 100 monsters with a kick
Find a boat for use in the jungle
Kill 50 monsters by smashing, decapitating or shooting them in the head
Obtain level 50
Escape from the ship