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