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