Here is the full list of all 94 Shop Titans achievements.
Increase your merchant level
Slay many bosses
Sell a ton of items
Bring back lots of components from quests
Clear many quests
Enchant many items
Have a Hero reach a high level
Craft many items
Spend a lot of rare resources
Earn tokens at the Fortune Zone
Reach Rudo’s final rank
Master many blueprints
Reach Yami's final rank
Upgrade a furniture to a high level
Reach Sia's final rank
Spend a lot of uncommon resources
Spend a lot of common resources
Reach Argon's final rank
Reach Lilu’s final rank
Fully ascend several items
Research lots of blueprints
Open many chests
Expand your shop
Make a lot of gold from a single sale
Deal massive damage with a single attack
Help fellow guild members
Earn lots of gold!
Spend a lot of energy
Hire many champions
Enchant an item with both a spirit and an element
Unlock all item types
Hire many workers
Enchant a legendary item