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