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