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