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