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