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