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 5 Infected in a row with a single blow.
Complete 25 quests while playing with at least one co-op partner.
Play Dead Island at least 28 days after starting it for the first time.
Find 120 collectibles.
Join another player's game.
Complete act 4.
Complete act 3.
Kill 250 zombies with modified weapons.
Save 5 people besieged by zombies.
Complete act 2.
Finish 75 quests cumulatively.
Reach level 25.
Kill 50 human enemies.
Kill a Suicider with a grenade.
Create a customized weapon.
Find 60 collectibles.
Sever 100 limbs.
Kill 250 zombies using edged melee weapons.
Complete act 1.
Drive a total distance of 10 kilometers.
Kill 50 zombies using a vehicle.
Kill 250 zombies using blunt melee weapons.
Travel a distance of 20 kilometers on foot.
Breach a locked door with the first blow.
Reach level 10.
Kill a zombie with 10 different melee weapons.
Complete 5 quests in a single co-op game with the same partners.
Customize 25 weapons
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.
Kill 250 zombies using firearms.
Kill 25 zombies with your bare fists.
Kill an Infected with a grenade blast.
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 100 enemies with Fury attacks.
Create weapons to rival the gods of fire or thunder.
Kill 150 enemies using Analog Fighting controls.
Kill a Ram using tackle skill.
Kill a Butcher using an axe
Loot 25 Exceptional Weapons.