Here is the full list of all 15 Dungeon Avenger achievements.
Bronze award for total seconds remaining
Silver award for total seconds remaining
Gold award for total seconds remaining
Bronze award for total guards killed
Silver award for total guards killed
Gold award for total guards killed
Bronze award for total levels completed
Silver award for total levels completed
Gold award for total levels completed
Bronze award for total guardians killed
Silver award for total guardians killed
Gold award for total guardians killed
Bronze award for total bosses killed
Silver award for total bosses killed
Gold award for total bosses killed