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 50 human enemies.
Complete act 2.
Save 5 people besieged by zombies.
Finish 75 quests cumulatively.
Find 60 collectibles.
Kill 250 zombies with modified weapons.
Reach level 25.
Sever 100 limbs.
Kill 250 zombies using edged 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.
Kill a zombie with 10 different melee weapons.
Reach level 10.
Complete 5 quests in a single co-op game with the same partners.
Complete 5 quests with 3 co-op partners.
Play in a co-op team of 4 different playable characters.
Join another player's game.
Breach a locked door with the first blow.
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.
Set 10 zombies on fire simultaneously.
Kill 10 zombies in a row with headshots.
Kill 250 zombies using blunt melee weapons.
Kill 250 zombies using firearms.
Kill 25 zombies with your bare fists.
Kill 50 zombies using a vehicle.
Kill an Infected with a grenade blast.
Drive a total distance of 10 kilometers.
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 3.
Complete act 4.
Complete act 1 with 4 different characters.
Reach level 50
Find 120 collectibles.
Play with 10 different co-op partners for at least 15 minutes each.
Kill 100 enemies with Fury attacks.
Create weapons to rival the gods of fire or thunder.
Kill a Suicider with a grenade.
Kill 150 enemies using Analog Fighting controls.
Kill a Ram using tackle skill.
Kill a Butcher using an axe
Loot 25 Exceptional Weapons.