| Event | Time | Meet | Date |
|---|---|---|---|
| 100m Backstroke | 1:13.50 | 2025 Central Region Div 2 LC Championships | 2025-06-13 |
| 100m Backstroke | 1:08.83 | 2026 Central Region Div 2 SC Championships | 2026-02-20 |
| 100m Breaststroke | 1:16.15 | 2025 Central Region Div 1 LC Championships | 2025-06-20 |
| 100m Breaststroke | 1:10.81 | 2026 Central Region Div 1 SC Championships | 2026-02-06 |
| 100m Butterfly | 1:08.17 | 2026 Central Region Div 2 SC Championships | 2026-02-20 |
| 100m Freestyle | 59.38 | 2025 Central Region Div 1 LC Championships | 2025-06-20 |
| 100m Freestyle | 56.97 | 2025 Alex Baumann Invitational | 2025-11-21 |
| 200m Backstroke | 2:38.19 | 2025 Central Region Div 2 LC Championships | 2025-06-13 |
| 200m Backstroke | 2:29.51 | 2026 Central Region Div 2 SC Championships | 2026-02-20 |
| 200m Breaststroke | 2:49.53 | 2025 Central Region Div 2 LC Championships | 2025-06-13 |
| 200m Breaststroke | 2:37.23 | 2026 Central Region Div 1 SC Championships | 2026-02-06 |
| 200m Freestyle | 2:14.25 | 2025 Central Region Div 1 LC Championships | 2025-06-20 |
| 200m Freestyle | 2:05.98 | SCAR Cindy Nicholas Memorial Meet | 2025-11-01 |
| 200m IM | 2:33.25 | Scar Pan Am Winter Classic | 2026-01-16 |
| 200m IM | 2:22.47 | 2026 Central Region Div 1 SC Championships | 2026-02-06 |
| 400m Freestyle | 4:46.90 | 2025 Central Region Div 2 LC Championships | 2025-06-13 |
| 400m Freestyle | 4:33.56 | 2026 Central Region Div 2 SC Championships | 2026-02-20 |
| 400m IM | 5:13.23 | 2026 Central Region Div 2 SC Championships | 2026-02-20 |
| 50m Backstroke | 32.64 | 2026 Central Region Div 2 SC Championships | 2026-02-20 |
| 50m Breaststroke | 33.96 | Scar Pan Am Winter Classic | 2026-01-16 |
| 50m Breaststroke | 32.60 | 2026 Central Region Div 1 SC Championships | 2026-02-06 |
| 50m Butterfly | 29.25 | 2026 Central Region Div 2 SC Championships | 2026-02-20 |
| 50m Freestyle | 27.26 | Scar Pan Am Winter Classic | 2026-01-16 |
| 50m Freestyle | 26.23 | 2026 Central Region Div 1 SC Championships | 2026-02-06 |
Jachymek, Gregory's top personal bests include 100m Backstroke (1:13.50), 100m Backstroke (1:08.83), 100m Breaststroke (1:16.15), 100m Breaststroke (1:10.81), 100m Butterfly (1:08.17).
Jachymek, Gregory swims for Scarborough Swim Club.
Jachymek, Gregory has competed in 9 meets.