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