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