How’s this?

SELECT * FROM gallery2 WHERE topic_id="765078" UNION SELECT * FROM gallery2 WHERE topic_id="306037" UNION SELECT * FROM gallery2 WHERE topic_id="429116" UNION SELECT * FROM gallery2 WHERE topic_id="325583" UNION SELECT * FROM gallery2 WHERE topic_id="1248551" UNION SELECT * FROM gallery2 WHERE topic_id="1072867" UNION SELECT * FROM gallery2 WHERE topic_id="53904" UNION SELECT * FROM gallery2 WHERE topic_id="912203" UNION SELECT * FROM gallery2 WHERE topic_id="933654" UNION SELECT * FROM gallery2 WHERE topic_id="247284" UNION SELECT * FROM gallery2 WHERE topic_id="669950" UNION SELECT * FROM gallery2 WHERE topic_id="1602272" UNION SELECT * FROM gallery2 WHERE topic_id="232736" UNION SELECT * FROM gallery2 WHERE topic_id="865123" UNION SELECT * FROM gallery2 WHERE topic_id="670531" UNION SELECT * FROM gallery2 WHERE topic_id="1276359"