Achery is located some 20 km south by southeast of Saint-Quentin and 10 km north-east of Tergnier. The commune is on the Oise river which flows south forming the north-western border of the commune before flowing through the commune and continuing south. The tributary of the Oise, the Serre, forms the southern border of the commune before joining the Oise just south of Achery. The town of Achery is about 1.5 km directly south of Mayot on Highway D13 which passes through Achery south to Danizy. Other roads into the commune are the D643 (Rue Jules Lesage) west from the village to Travecy and also east (Rue Jean Moulin) to Anguilcourt-le-Sart. The Rue de Fort forms most of the northern border of the commune with various country roads forming most of the western border.

Some distance from the town there is a quarry and an old gunpowder factory.

In the distant past, the village was called Achiriacus in 990.

Achery had its own lords. The lordship had his castle but it was destroyed once before being rebuilt in the 14th century. The lordship fell to the Count of Anizy. During the French Revolution the castle was destroyed and Achery became an independent commune. During the First World War, the village was completely destroyed but was rebuilt after the war.

This list is incomplete; you can help by adding missing items. (April 2021)

List of Mayors of Achery

Historical population

Year Pop. ±% p.a. 1793 689 —     1800 761 +1.43% 1806 754 −0.15% 1821 862 +0.90% 1831 1,046 +1.95% 1836 1,099 +0.99% 1841 1,125 +0.47% 1846 1,117 −0.14% 1851 1,088 −0.52% 1856 1,099 +0.20% 1861 1,074 −0.46% 1866 1,046 −0.53% 1872 924 −2.05% 1876 927 +0.08% 1881 895 −0.70% 1886 908 +0.29% 1891 809 −2.28% 1896 763 −1.16%	Year Pop. ±% p.a. 1901 671 −2.54% 1906 687 +0.47% 1911 655 −0.95% 1921 451 −3.66% 1926 464 +0.57% 1931 449 −0.66% 1936 469 +0.88% 1946 520 +1.04% 1954 501 −0.46% 1962 508 +0.17% 1968 524 +0.52% 1975 508 −0.44% 1982 578 +1.86% 1990 564 −0.31% 1999 540 −0.48% 2007 539 −0.02% 2012 620 +2.84% 2017 598 −0.72%
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Source: EHESS and INSEE

• Flea market in May
• Festival on the third Sunday in June

• The Church of Saint-Martin: rebuilt after the First World War
• An Old water mill
• The Dovecote Square
• Marshes and ponds
• Remains of many blockhouses of the Hindenburg Line

• Communes of the Aisne department

Wikimedia Commons has media related to Achery.

• Achery on Géoportail, National Geographic Institute (IGN) website (in French)
• Achery on the 1750 Cassini Map