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