Full list of all 70 We Happy Few achievements worth 1,540 gamerscore. It takes around 40-50 hours to unlock all of the achievements in the base game.
The base game contains 40 achievements worth 1,000 Gamerscore, and there are 3 DLC packs containing 30 achievements worth 540 Gamerscore.
Completed Arthur's intro
Read all newspaper articles as Arthur, and redacted only the uncomfortable ones
Took the Joy at the very beginning of the game
Correctly sabotaged Clive Birtwhistle's redactor work
Take Phlash as Arthur
Kill 100 NPCs across all playthroughs
Listen to all the phone calls in the phoneboxes
Kill a guy named Ryan Andrews
Retrieve the credentials from the club
Finish all of the butcher's apprentice quests
Complete "Band of Brothers" encounter
Deliver the cod liver oil
Cross into the Village for the first time
Set foot on every island
Finish Mystery House without being spotted once
In Thomasina House - Collect all fake cats
Unlock all of Arthur's shelters
Contract and cure the plague
Complete the entire game without directly murdering anyone
Gain £1000 from looting/bartering across playthroughs
Survive 50 days
Die while overdosing on Joy
Find all collectibles
Collect all Uncle Jack Shows
Finish Arthur's playthrough
Find all notes related to Prudence
Talk to Johnny Bolton from the Secret Radio Room
Complete Sally intro
Knock out 50 NPCs with the Atomizer
Complete the Crones encounter
Complete speaking with Verloc at the Joy Factory
Finish Sally's playthrough
Catch 40 butterflies with Sally's butterfly net
Inject yourself with glucose 10 times
Use 25 lightning rods, playing as Ollie
Complete Ollie's intro
Complete "No Place Like Home" encounter
Complete "The Jack-o-Bean Club" encounter.
Spread the Message
Finish Ollie's playthrough
Destroy 50 Explosive Barrels
Get 100 Headshots
Pick Up All Lore Items
Kill 8 Robots in the Intro
Complete Act 1
Save all the Villagers
Complete Act 2
Complete Act 3
Push 7 Robots Into the Smelter
Complete the DLC
Lifetime Achievement Award
Survive Day 1
Survive Day 2
Vibe All Nick Statues
Blow Minds of 15 People After a Charged Facemelt
Serenade 30 people
Parry 30 attacks with the Vibe
Hit 3 NPCs with the Same Gold Record
Pole Dance Naked
Did Your Duty
Restored Order at Haworth Labs
Shut Off Joy Supply to Waterworks
Collected All Lore Notes
Unlocked All Upgrades
Found Loot in Alleyway
Found Loot in Canal
Knocked Down 40 NPCs With Whip Shove Combo
Zapped 20 Different TVs with Dart Gun
Finished DLC With No Upgrades