Full list of all 35 Dead Island Riptide achievements worth 1,000 gamerscore. It takes around 20-25 hours to unlock all of the achievements on Xbox 360.
Kill 100 enemies using charge attacks
Complete all the main quests cooperatively with any number of partners
Finish all quests in the game
Find and kill all named champion monsters located in dead zones
Finish hospital quests for Cecil
Finish quests for Dr. Kessler
Kill 10 monsters with one mine
Find 50% of collectibles
Obtain level 70
Mark 100 opponents which were then killed by your co-op partners
Kill 100 monsters using the boat's speed boost
Kill 100 monsters with a kick
Kill 25 monsters with a chainsaw
Finish the game
Defeat Harlow
Enter the docks in Quarantine Zone
Make pact with Serpo
Survive the horde on the roof
Gain access to a long-range radio station
Clear out the cinema
Reach Henderson
Kill special enemies: Grenadier, Thug, Wrestler, Infected, Suicider, Screamer, Butcher, Floater.
Kill the Twins
Successfully defend the tunnel entrance
Install a total of 5 barricades during hub defense
Kill 100 monsters with thrown melee weapons
Find a boat for use in the jungle
Kill 50 monsters by smashing, decapitating or shooting them in the head
Rescue 20 NPCs that have been grabbed by monsters
Escape from the ship
Obtain level 50
Find all the secret files
Find all collectibles
Find all pages from the guide book
Find all the volunteer's voice recordings