The word uses on'yomi readings for 達 (タツ) and 成 (セイ). The 'っ' (sokuon) is a common sound change when a 'ツ' ending kanji is followed by an 'S' sound. So, たせい is incorrect. It means to successfully accomplish or achieve a goal or task.
達成は達(タツ)と成(セイ)の音読みで、「ツ」音の後に「セ」音が続き促音「っ」が生じます。そのため「たせい」は誤りです。目標や課題などを完全に成し遂げることを意味します。
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