2 missable achievements (plus 21 unknown)
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You will unlock this during Chapter 8, 'Front Row'. Simply clear out the cinema of all zombies inside
You will unlock this during Chapter 12, 'With The Tide' main quest
Find all voice recordings of a journalist
Dr. Kessler is located inside the Research Laboratory, in the Flooded Jungle. Dr. Kessler will give you one side quest called 'History Lesson'. Simply complete it and turn it in.
Kill special enemies: Grenadier, Thug, Wrestler, Infected, Suicider, Screamer, Butcher, Floater.
You will unlock this during Chapter 9, 'Militarized Zone'.
This will unlock during Chapter 13. Simply defeat Harlow
Rescue 20 NPCs from clench
Kill 100 zombies with a kick.
You will unlock this during Chapter 10, 'Evacuation' main quest.
You will unlock this during Chapter 5, 'Stalwart Defense' man quest.
Kill 50 zombies by smashing, decapitating or shooting them in the head
Kill 25 zombies with a chainsaw
Kill 10 zombies with one mine
Complete all the main quests cooperatively with any number of partners
Kill the Twins
Cecil is located inside the Makeshift Hospital, in Henderson. Cecil will give you two side quests, 'The Darkness' & 'Healthcare'. Simply complete them and turn it in.
Kill 100 enemies using charge attacks
Gain level 50
Simply play the game and you should get this achievement. You start Dead Island Riptide on level 15 so you should be able to reach level 50 in your first playthrough of the game.
You will unlock this during Chapter 11, 'The Crash' main quest.
Gain level 70
Obtainable in your second playthrough of the game with the same character. Simply play through the game and it should unlock.
Find all the secret files of Consortium
You will unlock this during Chapter 2, 'New Beginnings' main quest
Find all pages from the guide book
You will unlock this during Chapter 7, 'Terminal Siege' main quest.
Install 5 barricades in any hub
Find and kill all named champion monsters located in dead zones
Find 50% of collectibles
Kill 100 zombies with thrown melee weapons
Find all collectibles
Mark 100 opponents which then were killed by your coop partners
This will unlock after the Prologue, 'The Storm' main quest
Kill 100 zombies using boat speed boost
This unlocks once you have defeated Harlow and make it onto the boat at the end of the game.
Finish all quests in the game