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