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.
Use a large medkit to heal an injury of 5% or less.
Explore the entire island.
Complete act 3.
Find 120 collectibles.
Kill 50 human enemies.
Complete act 2.
Loot 25 Exceptional Weapons.
Kill 250 zombies with modified weapons.
Finish 75 quests cumulatively.
Customize 25 weapons
Reach level 25.
Complete act 1.
Kill 250 zombies using edged melee weapons.
Sever 100 limbs.
Play Dead Island at least 28 days after starting it for the first time.
Breach a locked door with the first blow.
Create weapons to rival the gods of fire or thunder.
Find 60 collectibles.
Save 5 people besieged by zombies.
Drive a total distance of 10 kilometers.
Kill 50 zombies using a vehicle.
Kill 250 zombies using blunt melee weapons.
Kill 25 zombies with your bare fists.
Travel a distance of 20 kilometers on foot.
Kill a Suicider with a grenade.
Complete 25 quests while playing with at least one co-op partner.
Kill a zombie with 10 different melee weapons.
Join another player's game.
Reach level 10.
Create a customized weapon.
Complete 5 quests in a single co-op game with the same partners.
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.
Kill an Infected with a grenade blast.
Heal yourself with a medkit 100 times.
Complete act 1 with 4 different characters.
Reach level 50
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.
Kill a Butcher using an axe