Achilles '29 became Hoofdklasse champions for the first time in 1983 in the Hoofdklasse Sunday B. In 2006, Achilles became champions in the Hoofdklasse once again, now in the Hoofdklasse Sunday C, with a two-point lead over rival De Treffers. Two seasons later a comparable Hoofdklasse victory was achieved as Achilles '29 played De Treffers in the last match of the season. If De Treffers managed to win the match, they would become champions. As long as Achilles '29 managed to gain at least one point (either a draw or a win) the championship would go to De Heikant. In a historic derby, the home team won 3–2 and thus became champions of the Hoofdklasse for the third time.
In 2010, a new league was created, making the Hoofdklasse the second highest league of Dutch amateur football. With the new Topklasse, there won't be any clashes between the Hoofdklasse champions for the Saturday or Sunday title, but the champions of the Topklasse will become the direct Saturday or Sunday champions. The Saturday and Sunday champions still battle for the national title. In the first Topklasse season, relegated Eerste Divisie team FC Oss won the Sunday title, by beating Achilles '29 on the last match of the season with 0–2. Achilles '29 finished on second place, just missing out to a decision duel by losing on the last day. In the following season, Achilles '29 became the champions of the Topklasse Sunday with a nine-point lead over Haaglandia. As the Sunday overall champions they faced Saturday champions SV Spakenburg for the national title. In the first leg they won 3–0 and in the second leg 0–2, becoming the national champions in amateur football for the first time with a 5–0 aggregate win. Achilles '29 hereby received an option of promotion to the Eerste Divisie, but didn't chose to use it. In the 2012–13 Topklasse season Achilles '29 were the title favorites, as reigning champions. After 11 matches they became top of the table and remained there for the rest of the season. They lost the national title to VV Katwijk, but unlike Katwijk, Achilles chose to use their right of promotion following dispensation to some aspects in the licence for professional football. As a result, they play in the Eerste Divisie for the 2013–14 season, having drawn their first game in professional football against FC Emmen.