Here is the full list of all 15 iterform achievements.
100th death
complete all tutorial levels on hardcore
complete 10 levels with A+ replicas
10th death
complete all tutorial leves
first death
complete one level with A+ replicas
complete all levels with A+ replicas
complete all easy levels
complete all normal leves
unlock secret level
complete the game
complete all easy levels on hardcore
complete all normal levels on hardcore