What term describes someone's achievement as 'smug' or 'satisfied'?

The term that describes someone's achievement as 'smug' or 'satisfied' is "complacent." When a person is complacent, they often have a sense of self-satisfaction, particularly when they believe they have achieved something significant, sometimes to the point of being unaware of potential dangers or deficiencies. This can lead to a false sense of security or an inflated sense of self-importance regarding their accomplishments.

In contrast, a "conciliatory" attitude involves making peace or reconciling differences, which does not inherently carry the sense of smugness. "Benevolent" refers to a disposition characterized by kindness and goodwill, lacking any connotation of self-satisfaction or smugness. Meanwhile, "devious" describes cunning or deceitful behavior, which is unrelated to the notion of being satisfied or smug about one's achievements. Therefore, "complacent" is the term that most accurately captures the essence of someone feeling smug or overly satisfied with their own accomplishments.