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