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