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