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