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