One Line: Letters and Codes Achievements Here is the full list of all 10 One Line: Letters and Codes achievements.Filter Achievement View View Image viewList view Sort by Won first then 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 AllWonNot wonLove LetterRead the real letter 14 January 2026 - Add a guide40 CardsComplete 40 levels 14 January 2026 - Add a guideRead the LetterReveal all pieces of the letter 14 January 2026 - Add a guide30 piecesReveal 30 pieces of the letter 13 January 2026 - Add a guide30 CardsComplete 30 levels 13 January 2026 - Add a guide20 piecesReveal 20 pieces of the letter 23 April 2024 - Add a guide20 CardsComplete 20 levels 23 April 2024 - Add a guide10 piecesReveal 10 pieces of the letter 23 April 2024 - Add a guideFirst pieceReveal 1 piece of the letter 23 April 2024 - Add a guide10 CardsComplete 10 levels 23 April 2024 - Add a guide