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