TrueAchievements is described as 'Xbox achievement-tracking website that uses a novel method of assessment, TrueAchievement score, rather than a simple Gamerscore. The website features a free scanning service that pulls achievement data and other information from Xbox' and is an game in the games category. There are five games similar to TrueAchievements for Web-based and Playstation. The best TrueAchievements alternative is TrueSteamAchievements. It's not free, so if you're looking for a free alternative, you could try TrueSteamAchievements or PSNProfiles. Other TrueAchievements like games are TrueTrophies and PSN Trophy Leaders.
TrueSteamAchievements is the home of Steam news, achievement lists and guides, reviews, interviews, leaderboards and more
TrueSteamAchievements is the most popular Web-based alternative to TrueAchievements.
TrueSteamAchievements is the most popular free alternative to TrueAchievements.
Database to keep track of your Playstation games & trophies, find useful guides and meet fellow gamers in the community.
Track achievements, trophies and challenges across PSN, Xbox, Steam, Origin, and Blizzard
TrueTrophies is the home of Playstation news, trophy lists and guides, reviews, interviews, leaderboards and more
Both are good websites doing a great job at what they do. BUT, TrueTrophies is tracking your PlayStation trophies, where TrueAchievements track your Xbox achievements.
Also, both sites are made and maintained by the same team, which make TrueTrophies the PlayStation version of TrueAchievements.