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