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.
Save 5 people besieged by zombies.
Finish 75 quests cumulatively.
Complete 25 quests while playing with at least one co-op partner.
Find 60 collectibles.
Complete 5 quests with 3 co-op partners.
Play in a co-op team of 4 different playable characters.
Complete 5 quests in a single co-op game with the same partners.
Breach a locked door with the first blow.
Reach level 25.
Customize 25 weapons
Kill 50 human enemies.
Play Dead Island at least 28 days after starting it for the first time.
Reach level 50
Kill a Suicider with a grenade.
Complete act 1.
Kill 250 zombies with modified weapons.
Kill 250 zombies using edged melee weapons.
Sever 100 limbs.
Drive a total distance of 10 kilometers.
Travel a distance of 20 kilometers on foot.
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.
Join another player's game.
Kill 5 Infected in a row with a single blow.
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 2.
Complete act 3.
Complete act 4.
Complete act 1 with 4 different characters.
Find 120 collectibles.
Play with 10 different co-op partners for at least 15 minutes each.
Kill 100 enemies with Fury attacks.
Kill 150 enemies using Analog Fighting controls.
Kill a Ram using tackle skill.
Kill a Butcher using an axe
Loot 25 Exceptional Weapons.