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