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.
Heal yourself with a medkit 100 times.
Kill 5 Infected in a row with a single blow.
Complete act 1 with 4 different characters.
Play Dead Island at least 28 days after starting it for the first time.
Kill 250 zombies using firearms.
Kill 10 zombies in a row with headshots.
Use a large medkit to heal an injury of 5% or less.
Kill 150 enemies using Analog Fighting controls.
Set 10 zombies on fire simultaneously.
Kill a Ram using tackle skill.
Play in a co-op team of 4 different playable characters.
Kill an Infected with a grenade blast.
Use a hammer to kill a series of 15 zombies without taking damage.
Reach level 50
Loot 25 Exceptional Weapons.
Complete act 4.
Explore the entire island.
Customize 25 weapons
Kill 250 zombies using edged melee weapons.
Complete act 3.
Find 120 collectibles.
Kill a Suicider with a grenade.
Kill a Butcher using an axe
Sever 100 limbs.
Kill 100 enemies with Fury attacks.
Breach a locked door with the first blow.
Find 60 collectibles.
Complete act 2.
Create weapons to rival the gods of fire or thunder.
Kill 50 human enemies.
Reach level 25.
Kill 250 zombies with modified weapons.
Kill 25 zombies with your bare fists.
Kill 50 zombies using a vehicle.
Drive a total distance of 10 kilometers.
Finish 75 quests cumulatively.
Play with 10 different co-op partners for at least 15 minutes each.
Kill 250 zombies using blunt melee weapons.
Save 5 people besieged by zombies.
Create a customized weapon.
Travel a distance of 20 kilometers on foot.
Complete 25 quests while playing with at least one co-op partner.
Complete 5 quests with 3 co-op partners.
Kill a zombie with 10 different melee weapons.
Complete act 1.
Reach level 10.
Complete 5 quests in a single co-op game with the same partners.
Join another player's game.