Here is the full list of all 12 KungFu Strike Demo achievements.
Get 20 “S” ranks
Summon Giant Guard once (you must first unlock Giant Guard in My Army).
Get 3 “S” Ranks.
Play V.S. mode once.
Clear all Campaign levels.
Clear 8 levels in Co-op Campaign.
Perform 50 “Critical Hits” in any mode.
Spend a total of 20,000 Gold on items and moves.
Clear 1 level in Co-op Campaign.
Equip an item in the Item Store
Clear the first 3 levels.
Use a Chi Move in mid-air.