Here is the full list of all 28 The Hex achievements. It takes around 8-10 hours to unlock all of the achievements on Windows.
Crashed Secrets of Legendaria.
Crashed Waste World.
Crashed Walk
Crashed Combat Arena X.
Crashed Super Weasel Kid '09.
Free Vallamir.
Score a true KO on Alley Gator in Combat Arena X.
Learn all of Catarina's secrets in Super Weasel Kid.
Receive 4 card readings from Catarina in Walk.
Find Missing No. in Secrets of Legendaria.
Discovered the truth about Mr. Shrewd.
Complete the original Super Weasel Kid without any help from Mr. Shrewd.
Buy 10 upgrades from the Scrap Shop in Waste World.
Deal at least 500 damage in a single strike in Secrets of Legendaria.
Perform a 360 No Scope with the sniper rifle.
Wooed a Great Kraken.
Crack a soda vending machine at The Six Pint.
Crack all the vending machines at The Six Pint.
Activate a gated mod in Waste World.
Completed ???'s memory.
Opened The Hex.
Completed Chandrelle's memory.
Completed Rust's memory.
Completed Lazarus' memory.
Help Rebecha survive the first wave in Walk.
Completed Super Weasel Kid's memory.
Completed Bryce's memory.
Score a 1000 hit combo in Combat Arena X.