Lesson Learned Achievements Here is the full list of all 24 Lesson Learned achievements.Filter Achievement View View Image viewList view Sort by TrueSteamAchievement desc TrueSteamAchievement asc Achievement name desc Achievement name asc TSA Ratio desc TSA Ratio asc Gamers desc Gamers asc Steam order Date won desc Date won asc What are achievement flags? Click to find outApply First lessonComplete the tutorial. Second lessonSurvive the first wave. LucyDefeat Lucy. TutankhamunDefeat Tutankhamun. Gaius Julius CaesarDefeat Gaius Julius Caesar. Pope Innocent IIIDefeat Pope Innocent III. Napoleon BonaparteDefeat Napoleon Bonaparte. PrickerBuild your first Pricker. BoomerBuild your first Boomer. SpitterBuild your first Spitter. TeslaBuild your first Tesla. HammerBuild your first Hammer. DragonBuild your first Dragon. Level UPLevel up your tower. UpgradeBuy your first upgrade FIrst gradeDefeat your first 10 monsters. Second gradeDefeat your first 50 monsters. Third gradeDefeat your first 100 monsters. Fourth gradeDefeat your first 500 monsters. Fifth gradeDefeat your first 1000 monsters. Builder apprenticeBuild your first 10 towers. Builder journeymanBuild your first 50 towers. Builder masterBuild your first 100 towers. Winston ChurchillDefeat Winston Churchill.