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