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