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