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