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