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