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.
Customize 25 weapons
Kill 5 Infected in a row with a single blow.
Use a hammer to kill a series of 15 zombies without taking damage.
Kill 50 human enemies.
Set 10 zombies on fire simultaneously.
Kill 10 zombies in a row with headshots.
Kill 250 zombies using edged melee weapons.
Kill 250 zombies using firearms.
Kill an Infected with a grenade blast.
Sever 100 limbs.
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.
Reach level 25.
Reach level 50
Find 120 collectibles.
Save 5 people besieged by zombies.
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 a Suicider with a grenade.
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.
Find 60 collectibles.
Finish 75 quests cumulatively.
Kill 250 zombies using blunt melee weapons.
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.
Travel a distance of 20 kilometers on foot.
Complete act 1.
Create a customized weapon.
Reach level 10.
Drive a total distance of 10 kilometers.
Kill 50 zombies using a vehicle.
Kill a zombie with 10 different melee weapons.
Kill 25 zombies with your bare fists.
Breach a locked door with the first blow.
Complete 5 quests in a single co-op game with the same partners.
Join another player's game.