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