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