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