Full list of all 20 BOT.vinnik Chess: Combination Lessons achievements. It takes around 1-2 hours to unlock all of the achievements on Windows.
Complete all "Skewer" lessons
Complete all "Pin" lessons
Complete all "Knight Forks" lessons
Complete all "Pawn Forks" lessons
Complete all "Queen's Sacrifice" lessons
Complete all "Attacking the Castled King - Missing h7-Pawn" lessons
Complete all "Attacking the Castled King - Missing g7-Pawn" lessons
Complete all "Attacking the Castled King - Missing f7-Pawn" lessons
Complete all "Attacking the Castled King - Missing Knight" lessons
Complete all "Attacking the Castled King - Missing Rook" lessons
Complete all "Attacking the Castled King (Advanced Pawns)" lessons
Complete all "Attacks Against the Centralized King" lessons
Complete all "Deflection" lessons
Complete all "Back-Rank Mate" lessons
Complete all "Clearence Sacrifice" lessons
Complete all "Interception" lessons
Complete all "Smothered Mate" lessons
Complete all "Rooks on Seventh Rank" lessons
Complete all "Discovered Attack" lessons
Complete all BOT.vinnik Chess: Combination Lessons