Here is the full list of all 48 Dead Island achievements. It takes around 40-50 hours to unlock all of the achievements on Windows.
Reach level 50
Play with 10 different co-op partners for at least 15 minutes each.
Complete 5 quests with 3 co-op partners.
Play in a co-op team of 4 different playable characters.
Complete 25 quests while playing with at least one co-op partner.
Complete act 1 with 4 different characters.
Kill a Ram using tackle skill.
Kill 250 zombies using blunt melee weapons.
Kill 150 enemies using Analog Fighting controls.
Complete 5 quests in a single co-op game with the same partners.
Kill 250 zombies using firearms.
Use a hammer to kill a series of 15 zombies without taking damage.
Join another player's game.
Complete act 4.
Explore the entire island.
Heal yourself with a medkit 100 times.
Find 120 collectibles.
Complete act 3.
Kill 100 enemies with Fury attacks.
Loot 25 Exceptional Weapons.
Kill 10 zombies in a row with headshots.
Kill a Suicider with a grenade.
Kill an Infected with a grenade blast.
Kill a Butcher using an axe
Finish 75 quests cumulatively.
Customize 25 weapons
Use a large medkit to heal an injury of 5% or less.
Set 10 zombies on fire simultaneously.
Complete act 2.
Save 5 people besieged by zombies.
Find 60 collectibles.
Kill 250 zombies with modified weapons.
Reach level 25.
Kill 50 human enemies.
Kill 25 zombies with your bare fists.
Complete act 1.
Drive a total distance of 10 kilometers.
Kill 5 Infected in a row with a single blow.
Travel a distance of 20 kilometers on foot.
Play Dead Island at least 28 days after starting it for the first time.
Kill a zombie with 10 different melee weapons.
Create weapons to rival the gods of fire or thunder.
Kill 50 zombies using a vehicle.
Create a customized weapon.
Kill 250 zombies using edged melee weapons.
Sever 100 limbs.
Reach level 10.
Breach a locked door with the first blow.