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