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