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