Here is the full list of all 20 Super Trench Attack 2 achievements.
Beat the game on training mode
Have nine members on your squad
Have over 1500 food at one time
Have over 1500 gold at one time
Win 200 Gold during a blackjack event
Beat the tutorial mission
Perform a double kill
Perform a triple kill
Get an epic bonus!
Beat the game on normal mode
Beat the game on hard mode
Kill ten ducks during a hunt event
Win an Epic battle only using defend
Win an Epic battle only using grenades and mortars
Win an Epic battle only using pistols
Get a squad member to lvl13
Unlock all of Ada's layouts
Unlock all of Marie's layouts
Unlock all of Adele's layouts
Unlock all of Bella's layouts