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.
Free Vallamir.
Discovered the truth about Mr. Shrewd.
Crashed Waste World.
Crashed Secrets of Legendaria.
Crashed Super Weasel Kid '09.
Crack all the vending machines at The Six Pint.
Crashed Combat Arena X.
Score a 1000 hit combo in Combat Arena X.
Score a true KO on Alley Gator in Combat Arena X.
Crashed Walk
Receive 4 card readings from Catarina in Walk.
Wooed a Great Kraken.
Perform a 360 No Scope with the sniper rifle.
Learn all of Catarina's secrets in Super Weasel Kid.
Activate a gated mod in Waste World.
Buy 10 upgrades from the Scrap Shop in Waste World.
Find Missing No. in Secrets of Legendaria.
Complete the original Super Weasel Kid without any help from Mr. Shrewd.
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.
Crack a soda vending machine at The Six Pint.