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