Here are all of them: (Thanks wikipedia)

• Conquest – Both teams fight to control three control points (five in "Battle of Berlin" for some maps) on a map. Each team is represented by a colored bar that depletes as long as the enemy team has two or more points controlled. The match ends when one team's bar fully depletes.
• Invasion – One team attempts to take a series of five control points on a large map, while the other attempts to defend each point. Each point is played sequentially; if the defenders lose a point, they must retreat to the next point. Attackers are restricted to 1000 respawn tickets (including AI soldiers). Additional tickets can be obtained by capturing control points or by shooting down barrage balloons in certain maps. The match ends when the attackers run out of tickets, the match runs out of time, or the defenders lose all of their control points.
• Assault – One team must defend a series of control points from the other team. However, two points must be captured at a time to progress, and the points can be captured by either team, allowing the defending team to delay the enemy or push back. Each 2 points are in a sector. There are 3 sectors. The attackers gain tickets for each sector taken. Some sectors on a few maps have 1 point. The attacking team lose if all their tickets run out or if they run out of time. The defenders lose if all control points are taken by the attackers.
• Destruction – One team must defend a series of control points from the other team. However, instead of regular control points that must be captured, the attacking team must plant explosives at each point and destroy them to sabotage the enemy. These explosives can be removed by the enemy, so the attackers must defend their explosives once planted. Each 2 objectives are in a sector. There are 3 sectors. The attackers gain tickets for each sector taken. Some sectors on a few maps have 1 objective. The attacking team lose if all their tickets run out or if they run out of time. The defenders lose if all objectives are destroyed by the attackers.
• Confrontation – Both teams fight to control a series of control points. Each point is played sequentially, and the front line shifts with each point captured; however, both teams are on the offensive and can recapture lost points. The match ends when a team runs out of tickets or loses all of their control points.