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