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