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