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