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