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